decay

12 synonyms and 3 antonyms for decay, grouped by meaning and by how common each one is.

Verb — To rot or gradually break down, especially of organic matter.

Synonyms

Everyday swaps

Common words most readers know — safe in any writing.

decline

Less common

Still standard English, but they carry more weight.

degrade spoil deterioration decomposition

Rare, literary or technical

Precise, but they will stand out — check the sense before using one.

deteriorate crumble disintegration decompose dilapidate disintegrate fester

Synonyms by Meaning

1. verb

To rot or gradually break down, especially of organic matter.

“The fallen leaves slowly decayed into the soil.”

deteriorate degrade crumble spoil disintegration deterioration decompose dilapidate disintegrate fester

2. verb

To decline gradually in quality, strength, or condition.

“The old empire's power decayed over several centuries.”

Opposites

grow flourish

3. noun

The process or result of rotting or gradual deterioration.

“The building showed signs of decay after years of neglect.”

decomposition disintegration decline

Opposites

growth

How to use decay

The word patterns that sound natural to a native speaker.

tooth decay radioactive decay fall into decay

Etymology

From Anglo-Norman decaeir, ultimately from Latin dē- ("down, away") + cadere ("to fall") — the same root as "decadent" and "decadence."

Full origin of decay →

Frequently asked questions

What does “decay” mean?

The word “decay” means to rot or gradually break down, especially of organic matter. In plain terms, to rot or gradually get worse — used for teeth, buildings, empires, and even radioactive atoms.

How do you pronounce “decay”?

“Decay” is pronounced dih-KAY (/diˈkeɪ/ in IPA).

How do you use “decay” in a sentence?

Here is “decay” used in a sentence: “The fallen leaves slowly decayed into the soil.”

What is another word for “decay”?

Words with a similar meaning to “decay” include fester.

What part of speech is “decay”?

Depending on how it is used, “decay” can be a verb and a noun.

Where does the word “decay” come from?

The word “decay” comes from Latin. From Anglo-Norman decaeir, ultimately from Latin dē- ("down, away") + cadere ("to fall") — the same root as "decadent" and "decadence.".

Is “decay” a common word?

“Decay” is a fairly common word in modern English, usually learned at around the B2 level.

How many meanings does “decay” have?

“Decay” has 4 distinct senses listed in this dictionary. The most common is: to rot or gradually break down, especially of organic matter.

What is the difference between decay and rot?

Decay is the broader term, covering both the gradual breakdown of organic matter and the decline of quality, strength, or condition in non-organic things like buildings or institutions. Rot specifically refers to organic decomposition and is essentially one type of decay.

What does decay mean in physics?

In physics, decay describes the process by which an unstable atomic nucleus or particle breaks down over time, releasing energy or particles as it transforms into a more stable state. This is a specialized, technical use distinct from decay's everyday meaning of rotting or declining.

Can decay be used for things other than physical objects?

Yes, decay is commonly used figuratively to describe the gradual decline in quality, strength, or condition of abstract things, such as moral decay or the decay of a relationship, not just physical or organic breakdown.

People also searched

growth grow decline spoil deterioration flourish degrade decomposition crumble deteriorate disintegration decompose

Nearby words

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