🪦 45 Synonyms for Decaying: Best Words & Clear Meanings

Synonyms for decaying can help you describe gradual breakdown, deterioration, or decline with greater clarity and variety in different writing contexts.

Imagine an old wooden house slowly losing its strength after years of neglect. Words like rotting, deteriorating, and crumbling can describe its changing condition.

Learning synonyms for “decaying” helps students, bloggers, content writers, and English learners choose precise words, make their writing more engaging, and avoid repetition.

Understanding synonyms for decaying also improves essays, stories, reports, and everyday communication. The right alternative depends on whether you describe nature, objects, buildings, or situations.

Core Meaning Section

What Does “Decaying” Really Mean?

Decaying refers to the slow process of rot, decomposition, or structural decline in organic or physical matter. It represents a natural breakdown where living cells or solid materials lose integrity over time.

Native speakers understand decaying as wood rotting in damp soil, teeth losing enamel, or old buildings falling into ruin. The emotional tone is typically neutral, scientific, or somber, with a focus on natural deterioration.

This word appears constantly in biology textbooks, environmental studies, fantasy fiction, and horror writing. As an adjective or participle, decaying describes anything undergoing gradual physical breakdown.

Connotative Meaning

• Positive tone: Rarely positive, except when describing natural organic compost feeding new soil life.
• Neutral tone: Refers objectively to biological decomposition or physical structural breakdown.
• Negative tone: Implies neglect, ruin, foul odors, disease, or total structural collapse.
• Connotation: (The emotional or cultural associations surrounding a word beyond its strict dictionary definition.)

Etymology

The word decaying originates from Latin decadere, meaning to fall away or sink, through Old French decaoir.

• Old English (450–1100): The concept was expressed through native Germanic terms like rotian (to rot) or hrēowian.
• Middle English (1100–1500): The term decayen entered the language via Anglo-Norman French, replacing older native words in formal contexts.
• Modern English (1500–Present): By the eighteenth century, decaying became established as the standard scientific and descriptive term for physical deterioration.

Pronunciation

• US: /dɪˈkeɪ.ɪŋ/
• UK: /dɪˈkeɪ.ɪŋ/

Syllables

de-cay-ing

Affixation Pattern

• Root: cay (from Latin cadere, to fall)
• Prefix: de- (down, away)
• Suffix: -ing (present participle marker)

Synonyms List

Decomposing (Adjective) — US: /ˌdiː.kəmˈpoʊ.zɪŋ/ | UK: /ˌdiː.kəmˈpəʊ.zɪŋ/

• Meaning: Breaking down into smaller or simpler organic components.
• Tone/Register: Scientific, Biological
• Examples:
• Fungus grew rapidly across the decomposing log on the forest floor.
• Compost bins turn decomposing food scraps into rich garden soil.

Rotting (Adjective) — US: /ˈrɑː.tɪŋ/ | UK: /ˈrɒ.tɪŋ/

• Meaning: Undergoing physical breakdown through bacterial or fungal action.
• Tone/Register: Everyday, Descriptive
• Examples: The sweet smell of rotting fruit drew fruit flies into the kitchen. He stepped carefully around the rotting boards of the old porch.

Disintegrating (Adjective) — US: /dɪsˈɪn.təˌɡreɪ.tɪŋ/ | UK: /dɪsˈɪn.tɪˌɡreɪ.tɪŋ/

• Meaning: Breaking apart into small fragments or losing cohesion.
• Tone/Register: Technical, Descriptive
• Examples:
• Old paper maps were disintegrating after decades in the damp attic.
• The brittle plastic casing kept disintegrating in direct sunlight.

Crumbling (Adjective) — US: /ˈkrʌm.blɪŋ/ | UK: /ˈkrʌm.blɪŋ/

• Meaning: Breaking or falling apart into small pieces or fragments.
• Tone/Register: Visual, Structural
• Examples:
• Ivy climbed steadily up the crumbling brick wall of the castle.
• Workers repaired the crumbling foundation before winter arrived.

Wasting (Adjective) — US: /ˈweɪ.stɪŋ/ | UK: /ˈweɪ.stɪŋ/

• Meaning: Gradually losing strength, health, or physical substance.
• Tone/Register: Medical, Literary
• Examples:
• The long illness left him with a wasting physical weakness.
• Erosion caused a slow wasting of the coastal cliffside.

Fading (Adjective) — US: /ˈfeɪ.dɪŋ/ | UK: /ˈfeɪ.dɪŋ/

• Meaning: Slowly losing color, brightness, or strength.
• Tone/Register: Poetic, Visual
• Examples:
• Fading sunlight painted the evening sky in soft shades of pink.
• The vintage photograph showed fading colors from the Victorian era.

Withering (Adjective) — US: /ˈwɪð.ər.ɪŋ/ | UK: /ˈwɪð.ə.rɪŋ/

• Meaning: Drying out, shriveling, and losing freshness over time.
• Tone/Register: Botanical, Literary
• Examples:
• Withering flower petals dropped softly onto the garden path.
• The dry heat caused crops to start withering in the fields.

Spoiling (Adjective) — US: /ˈspɔɪ.lɪŋ/ | UK: /ˈspɔɪl.ɪŋ/

• Meaning: Becoming unfit for consumption or use due to decay.
• Tone/Register: Domestic, Everyday
• Examples:
• Leaving dairy products out in the sun leads to rapid spoiling.
• She checked the refrigerator to prevent milk from spoiling.

Putrefying (Adjective) — US: /ˈpjuː.trəˌfaɪ.ɪŋ/ | UK: /ˈpjuː.trɪ.faɪ.ɪŋ/

• Meaning: Undergoing the rotting of organic matter with a foul odor.
• Tone/Register: Medical, Scientific
• Examples:
• The pungent smell of putrefying matter drifted from the swamp.
• Scientists analyzed the putrefying tissue samples in the laboratory.

Deteriorating (Adjective) — US: /dɪˈtɪr.i.əˌreɪ.tɪŋ/ | UK: /dɪˈtɪə.ri.əˌreɪ.tɪŋ/

• Meaning: Becoming progressively worse in condition or quality.
• Tone/Register: Formal, Professional
• Examples:
• Engineers inspected the deteriorating bridge structure for safety risks.
• His deteriorating vision made nighttime driving difficult.

Degenerating (Adjective) — US: /dɪˈdʒɛn.əˌreɪ.tɪŋ/ | UK: /dʒɪˈdʒɛn.əˌreɪ.tɪŋ/

• Meaning: Declining physically or morally to a lower standard.
• Tone/Register: Formal, Academic
• Examples:
• Medical charts tracked the degenerating joint tissue over time.
• Urban neighborhoods suffered from degenerating public infrastructure.

Perishing (Adjective) — US: /ˈpɛr.ɪ.ʃɪŋ/ | UK: /ˈpɛr.ɪ.ʃɪŋ/

• Meaning: Suffering complete ruin, destruction, or death.
• Tone/Register: Literary, Dramatic
• Examples:
• Perishing crops ruined the harvest for local farmers that year.
• Historic wooden artifacts were perishing in the humid vault.

Oxidizing (Adjective) — US: /ˈɑːk.sɪ.daɪ.zɪŋ/ | UK: /ˈɒk.sɪ.daɪ.zɪŋ/

• Meaning: Combining with oxygen, causing rust or chemical decay.
• Tone/Register: Chemical, Technical
• Examples:
• Exposed iron nails started oxidizing rapidly in the rain.
• Chemists studied oxidizing agents in metal corrosion tests.

Corroding (Adjective) — US: /ˈkɔːr.oʊ.dɪŋ/ | UK: /kəˈrəʊ.dɪŋ/

• Meaning: Damaging or destroying metal gradually by chemical action.
• Tone/Register: Technical, Industrial
• Examples:
• Salty ocean spray kept corroding the ship’s metal hull.
• Acid rain was slowly corroding the bronze outdoor statue.

Eroding (Adjective) — US: /ɪˈroʊ.dɪŋ/ | UK: /ɪˈrəʊ.dɪŋ/

• Meaning: Gradually wearing away soil or rock through natural elements.
• Tone/Register: Geological, Environmental
• Examples:
• Rivers were eroding the riverbanks after the heavy spring storms.
• Strong winds kept eroding the desert dunes.

Crumbling Away (Adjective) — US: /ˈkrʌm.blɪŋ əˈweɪ/ | UK: /ˈkrʌm.blɪŋ əˈweɪ/

• Meaning: Gradually falling apart into dust or tiny fragments.
• Tone/Register: Descriptive, Visual
• Examples:
• Ancient stone carvings were crumbling away from acid rain.
• The cliff edge was crumbling away near the hiking trail.

Falling Apart (Adjective) — US: /ˈfɑː.lɪŋ əˈpɑːrt/ | UK: /ˈfɔː.lɪŋ əˈpɑːt/

• Meaning: Breaking into pieces due to poor condition or age.
• Tone/Register: Casual, Everyday
• Examples:
• That old leather armchair is literally falling apart at the seams.
• His trusty backpack was falling apart after ten years of travel.

Breaking Down (Adjective) — US: /ˈbreɪ.kɪŋ daʊn/ | UK: /ˈbreɪ.kɪŋ daʊn/

• Meaning: Separating into simpler substances or failing.
• Tone/Register: Scientific, General
• Examples:
• Enzymes assist in breaking down food during human digestion.
• The old car engine kept breaking down on country roads.

Blighting (Adjective) — US: /ˈblaɪ.tɪŋ/ | UK: /ˈblaɪ.tɪŋ/

• Meaning: Causing a plant disease that destroys leaves and stems.
• Tone/Register: Agricultural, Botanical
• Examples:
• A sudden fungal disease began blighting local tomato crops.
• Gardeners removed infected leaves to stop blighting the vineyard.

Corrupting (Adjective) — US: /kəˈrʌp.tɪŋ/ | UK: /kəˈrʌp.tɪŋ/

• Meaning: Causing moral or physical deterioration and ruin.
• Tone/Register: Formal, Literary
• Examples:
• Damp air was corrupting the rare library manuscripts.
• Bad influences can have a corrupting effect on youth.

Tainting (Adjective) — US: /ˈteɪn.tɪŋ/ | UK: /ˈteɪn.tɪŋ/

• Meaning: Contaminating or spoiling something with unwanted elements.
• Tone/Register: Environmental, Formal
• Examples:
• Industrial runoff was tainting the crystal-clear river water.
• He worried about chemicals tainting the organic soil.

Contaminating (Adjective) — US: /kənˈtæm.ɪˌneɪ.tɪŋ/ | UK: /kənˈtæm.ɪ.neɪ.tɪŋ/

• Meaning: Making something impure by exposure to poisonous substances.
• Tone/Register: Scientific, Environmental
• Examples:
• Factory emissions were contaminating the surrounding air supply.
• Tested samples showed contaminating bacteria in the water tank.

Molder (Verb) — US: /ˈmoʊl.dər/ | UK: /ˈməʊl.də/

• Meaning: Slowly decayed or disintegrated into dust over time.
• Tone/Register: Literary, Poetic
• Examples:
• Forgotten letters began to molder in the wooden chest.
• Old wooden crates lay moldering in the damp cellar.

Deterioration (Noun) — US: /dɪˌtɪr.i.əˈreɪ.ʃən/ | UK: /dɪˌtɪə.ri.əˈreɪ.ʃn̩/

• Meaning: The process of becoming progressively worse or impaired.
• Tone/Register: Formal, Technical
• Examples:
• Doctors monitored the physical deterioration of the antique artifact.
• Building inspectors noted structural deterioration in the garage.

Decomposition (Noun) — US: /ˌdiː.kəm.pəˈzɪʃ.ən/ | UK: /ˌdiː.kəm.pəˈzɪʃ.n̩/

• Meaning: The state or process of rotting or breaking down organically.
• Tone/Register: Scientific, Botanical
• Examples:
• Microorganisms speed up organic decomposition in forest soils.
• The scientific study examined plant decomposition rates.

Putrescent (Adjective) — US: /pjuːˈtrɛs.ənt/ | UK: /pjuːˈtrɛs.ənt/

• Meaning: Undergoing the process of decay and emitting a foul, rotting odor.
• Tone/Register: Scientific, Literary
• Examples:
• The warm summer sun accelerated the putrescent breakdown of garden waste.
• Biologists analyzed the putrescent tissue samples inside the sealed container.

Spoiled (Adjective) — US: /spɔɪld/ | UK: /spɔɪld/

• Meaning: No longer fresh, edible, or useful due to decay or aging.
• Tone/Register: Everyday, Domestic
• Examples:
• She threw away the spoiled milk left sitting on the counter.
• Eating spoiled food can lead to sudden stomach illness.

Blighted (Adjective) — US: /ˈblaɪ.tɪd/ | UK: /ˈblaɪ.tɪd/

• Meaning: Affected by plant disease, decay, or severe damage.
• Tone/Register: Agricultural, Descriptive
• Examples:
• Farmers removed the blighted potato plants to protect the harvest.
• The orchard was blighted by a persistent fungal infection.

Perished (Adjective) — US: /ˈpɛr.ɪʃt/ | UK: /ˈpɛr.ɪʃt/

• Meaning: Destroyed, ruined, or decomposed completely over time.
• Tone/Register: Literary, Formal
• Examples:
• Ancient parchment scrolls had perished after centuries in the damp vault.
• The wooden support beams had perished long before the house was sold.

Corroded (Adjective) — US: /kəˈroʊ.dɪd/ | UK: /kəˈrəʊ.dɪd/

• Meaning: Damaged or worn away gradually by chemical action or rust.
• Tone/Register: Technical, Industrial
• Examples:
• Mechanics replaced the corroded battery cables under the hood.
• Salty water left the iron hinges completely corroded and stuck.

Rusting (Adjective) — US: /ˈrʌs.tɪŋ/ | UK: /ˈrʌs.tɪŋ/

• Meaning: Forming a reddish-brown coating of iron oxide through oxidation.
• Tone/Register: Descriptive, Industrial
• Examples:
• An old rusting bicycle sat abandoned behind the garden shed.
• They painted the rusting metal fence to prevent further damage.

Tainted (Adjective) — US: /ˈteɪn.tɪd/ | UK: /ˈteɪn.tɪd/

• Meaning: Contaminated or spoiled by undesirable elements or decay.
• Tone/Register: Formal, Environmental
• Examples:
• Tests confirmed the well water was tainted by agricultural runoff.
• He refused to consume the tainted meat from the broken freezer.

Contaminated (Adjective) — US: /kənˈtæm.ɪˌneɪ.tɪd/ | UK: /kənˈtæm.ɪ.neɪ.tɪd/

• Meaning: Made impure or dangerous by contact with polluting matter.
• Tone/Register: Scientific, Official
• Examples:
• Health inspectors condemned the contaminated food shipment immediately.
• Workers wore protective gear while handling contaminated soil samples.

Degenerate (Adjective) — US: /dɪˈdʒɛn.ər.ɪt/ | UK: /dʒɪˈdʒɛn.ər.ət/

• Meaning: Having declined or deteriorated physically or morally from a former standard.
• Tone/Register: Formal, Critical
• Examples:
• The once-grand estate had fallen into a degenerate state of neglect.
• Historians studied the degenerate architectural features of the fortress.

Deteriorated (Adjective) — US: /dɪˈtɪr.i.əˌreɪ.tɪd/ | UK: /dɪˈtɪə.ri.əˌreɪ.tɪd/

• Meaning: Become progressively worse in physical condition or quality.
• Tone/Register: Formal, Professional
• Examples:
• The storm left the coastal road in a heavily deteriorated condition.
• His hearing had deteriorated significantly over the past decade.

Disintegrated (Adjective) — US: /dɪsˈɪn.təˌɡreɪ.tɪd/ | UK: /dɪsˈɪn.tɪˌɡreɪ.tɪd/

• Meaning: Broken up into small parts, pieces, or basic elements.
• Tone/Register: Technical, Descriptive
• Examples:
• The fragile cotton fabric disintegrated upon being touched.
• Old cardboard boxes disintegrated in the flooded basement.

Frayed (Adjective) — US: /freɪd/ | UK: /freɪd/

• Meaning: Unraveled or worn at the edge through friction or aging.
• Tone/Register: Everyday, Descriptive
• Examples:
• She trimmed the frayed cuffs of her favorite wool sweater.
• The boat’s mooring rope was frayed and needed immediate replacement.

Sloughing (Adjective) — US: /ˈslʌf.ɪŋ/ | UK: /ˈslʌf.ɪŋ/

• Meaning: Shedding, casting off, or peeling away layer by layer.
• Tone/Register: Medical, Technical
• Examples:
• Dead tissue was sloughing off the healing wound naturally.
• The reptile was sloughing its old skin during spring growth.

Marcescent (Adjective) — US: /mɑːrˈsɛs.ənt/ | UK: /mɑːˈsɛs.ənt/

• Meaning: Withering without falling off, applied especially to dead leaves.
• Tone/Register: Botanical, Scientific
• Examples:
• Oak trees often display marcescent leaves throughout the winter months.
• Botanists noted the marcescent foliage clinging to the branches.

Necrotic (Adjective) — US: /nɛˈkrɑː.tɪk/ | UK: /nɛˈkrɒ.tɪk/

• Meaning: Relating to dead or decaying biological tissue.
• Tone/Register: Medical, Scientific
• Examples:
• Doctors removed the necrotic tissue from the patient’s foot.
• The frost caused necrotic patches to form on the plant leaves.

Atrophying (Adjective) — US: /ˈæt.rəˌfaɪ.ɪŋ/ | UK: /ˈæt.rə.faɪ.ɪŋ/

• Meaning: Wasting away or decreasing in size due to disease or lack of use.
• Tone/Register: Medical, Formal
• Examples:
• Inactivity can cause muscle tissues to start atrophying rapidly.
• Physical therapy prevents joints from atrophying after surgery.

Rancid (Adjective) — US: /ˈræn.sɪd/ | UK: /ˈræn.sɪd/

• Meaning: Smelling or tasting unpleasant as a result of being old and decomposed.
• Tone/Register: Descriptive, Sensory
• Examples:
• The forgotten butter in the pantry had turned completely rancid.
• An unpleasant rancid odor emanated from the old oil container.

Musty (Adjective) — US: /ˈmʌs.ti/ | UK: /ˈmʌs.ti/

• Meaning: Having a stale, moldy, or damp smell associated with decay.
• Tone/Register: Sensory, Everyday
• Examples:
• The old library books gave off a comforting musty scent.
• Basements often develop a musty odor during humid weather.

Stale (Adjective) — US: /steɪl/ | UK: /steɪl/

• Meaning: No longer fresh and appealing due to slow decay or age.
• Tone/Register: Everyday, Common
• Examples:
• The bakery bread grew stale after sitting out overnight.
• Stuffy rooms filled with stale air needed immediate ventilation.

Dilapidated (Adjective) — US: /dɪˈlæp.əˌdeɪ.tɪd/ | UK: /dɪˈlæp.ɪ.deɪ.tɪd/

• Meaning: In a state of disrepair or ruin as a result of age or neglect.
• Tone/Register: Formal, Descriptive
• Examples:
• They purchased a dilapidated farmhouse to renovate on weekends.
• The dilapidated barn collapsed during the winter snowstorm.

Synonyms By Tone

Understanding tone ensures your word choice matches your scientific or narrative intent. Using formal medical terms in a casual blog post feels unnatural, while using slang in an academic paper lacks professionalism.

• Formal / Scientific: Decomposing, Putrefying, Deteriorating, Oxidizing, Decomposition
• Neutral / Everyday: Rotting, Crumbling, Spoiling, Fading, Breaking Down
• Descriptive / Literary: Molder, Wasting, Perishing, Crumbling Away, Blighting

Mini Comparison

Decaying vs. Decomposing vs. Rotting

• Decaying: Refers generally to any gradual decline, structural breakdown, or organic rot. Use it for teeth, old wood, or failing infrastructure.
• Decomposing: Specifically emphasizes biological breakdown driven by bacteria and fungi into simpler organic matter. Use it in scientific or ecological writing.
• Rotting: Describes soft organic spoilage accompanied by foul smells or mushy textures. Use it for food, plants, or dead matter.

Context-Based Usage

Daily Conversation

In casual everyday talk, speakers rely on simple, familiar words like rotting, spoiling, or falling apart. People rarely use terms like putrefying or oxidizing when chatting with friends at home.

Writing or Blogging

Bloggers and content creators mix standard terms like decaying with descriptive verbs like crumbling, fading, or eroding. This keeps readers engaged without overwhelming them with dense scientific jargon.

Professional or Academic Tone

Scientific journals, environmental reports, and engineering manuals require precise terminology. Writers choose terms like decomposing, deteriorating, or corrosion to maintain technical accuracy.

Creative or Informal Use

Storytellers and novelists often use atmospheric action verbs such as molder, wasting, or perishing to build vivid imagery and suspense.

Common Mistakes & Native Usage

Common Mistakes Learners Make

• Using scientific verbs in casual stories: Writing that someone’s old bicycle is “oxidizing and putrefying” sounds overly clinical and absurd.
• Confusing physical decay with biological rot: Assuming “eroding” applies to organic food spoilage leads to inaccurate physical descriptions.
• Overusing repetitive action verbs: Repeating “decaying” in every sentence makes narrative prose feel dry and robotic.

Register Notes

Match your register to your narrative tone. Casual conversation favors lively words like rotting, while scientific writing benefits from precise terms like decomposing.

Real-Life Mini Scenarios

• Workplace: Civil engineers inspected deteriorating concrete structures along the aging highway.
• Social Situations: Gardeners cleared away rotting leaves from around the vegetable beds.
• Media / Pop Culture: The historical documentary explored ancient ruins slowly crumbling away in the desert.
• Writing / Storytelling: The abandoned cottage featured moldering books stacked on dusty wooden shelves.

Practice Exercise

1. Which term is best suited for a scientific report describing organic matter breaking down via bacteria?

• A) Rotting
• B) Decomposing
• C) Crumbling
• D) Fading

2. When referring to old food spoiling in a warm kitchen, which word is most natural?

• A) Oxidizing
• B) Rotting
• C) Deteriorating
• D) Degenerating

3. If a writer wants to describe ancient stone monuments slowly wearing away in the wind, which adjective fits best?

• A) Crumbling
• B) Spoiling
• C) Decomposing
• D) Putrefying

4. Which everyday term describes milk that has gone bad in the refrigerator?

• A) Spoiling
• B) Perishing
• C) Molder
• D) Corroding

5. What is the primary tone of the word “deteriorating” in professional engineering reports?

• A) Informal
• B) Slang
• C) Formal
• D) Playful

6. Which word describes metal rusting when exposed to moisture and air?

• A) Oxidizing
• B) Fading
• C) Wasting
• D) Blighting

7. When describing soil being washed away by heavy river currents, which geological term is most appropriate?

• A) Eroding
• B) Rotting
• C) Spoiling
• D) Putrefying

8. Which word describes old wooden books slowly decaying into dust in a damp cellar?

• A) Molder
• B) Fading
• C) Boiling
• D) Jiggling

9. What tone does the word “putrefying” convey in medical or scientific descriptions?

• A) Casual
• B) Scientific
• C) Playful
• D) Slang

10. Which term should you avoid in a casual conversation about old fruit?

• A) Rotting
• B) Putrefying
• C) Spoiling
• D) Fading

Reflection Task

Write a short sentence using the word “crumbling” to describe an old stone wall.

Answer Key: 1-B, 2-B, 3-A, 4-A, 5-C, 6-A, 7-A, 8-A, 9-B, 10-B

Conclusion

Learning synonyms for decaying helps you describe gradual breakdown, deterioration, and decline with greater precision. Words like rotting, decomposing, and deteriorating fit different contexts.

Using synonyms for decaying can make essays, blogs, stories, and academic writing more varied and accurate. The best alternative depends on whether you describe organic matter, buildings, conditions, or systems.

By practicing synonyms for decaying, you can expand your vocabulary and communicate more clearly. Try these alternatives in your essays, stories, and everyday conversations to strengthen your English..

Frequently Asked Questions

1. What is the closest synonym for “decaying”?

The closest synonym depends on the context. Deteriorating, decomposing, rotting, degrading, and declining are common alternatives. “Rotting” usually refers to organic matter, while “deteriorating” can describe buildings, conditions, systems, or situations.

2. What is a simple synonym for “decaying”?

Rotting is a simple and common synonym when talking about food, wood, plants, or other organic material. For broader contexts, worsening or deteriorating may be more suitable.

3. What is the difference between “decaying” and “deteriorating”?

Decaying often suggests gradual physical breakdown, especially in organic matter. Deteriorating is broader and means becoming worse in condition or quality. For example, a fallen tree may be decaying, while an old building may be deteriorating.

4. Can “decaying” describe a building?

Yes. Decaying can describe a building that is gradually falling into poor condition. Alternatives such as crumbling, deteriorating, and degrading can also work, depending on whether you want to emphasize physical damage or general decline.

5. What are good synonyms for “decaying” in academic writing?

For academic or formal writing, useful alternatives include decomposing, deteriorating, degrading, declining, and disintegrating. The correct choice depends on the subject. “Decomposing” is common in biology, while “deteriorating” works well for conditions, structures, and systems.