FOUL Synonyms: 646 Similar and Opposite Words

Q: How does the adjective 'foul' differ from other similar words?

Some common synonyms of foul are dirty , filthy , nasty , and squalid . While all these words mean "conspicuously unclean or impure," foul implies extreme offensiveness and an accumulation of what is rotten or stinking; it can also describe, for example, loathsome behavior. // a foul -smelling open sewer // a foul story of lust and greed

Q: When can 'dirty' be used instead of 'foul'?

Although the words dirty and foul have much in common, dirty emphasizes the presence of dirt more than an emotional reaction to it or, figuratively, stresses meanness or despicableness. // a dirty littered street // don't ask me to do your dirty work

Q: When could 'filthy' be used to replace 'foul'?

The meanings of filthy and foul largely overlap; however, filthy carries a strong suggestion of offensiveness and typically of gradually accumulated dirt that begrimes and besmears. Figuratively, it can also describe disgusting obscenity. // a stained greasy floor, utterly filthy // filthy street language

Q: How is 'nasty' related to other words for 'foul'?

Nasty applies to what is actually foul or is repugnant to one expecting freshness, cleanliness, or sweetness; in practice, however, nasty is often weakened to the point of being no more than a synonym of unpleasant or disagreeable . When used figuratively, nasty implies a peculiarly offensive unpleasantness. // it's a nasty job to clean up after a sick cat // had a nasty fall // his answer gave her a nasty shock // a stand-up comedian known for nasty humor

Q: When would 'squalid' be a good substitute for 'foul'?

In some situations, the words squalid and foul are roughly equivalent. However, squalid adds to the idea of dirtiness and filth that of slovenly neglect. Distinctively, its figurative use implies sordidness as well as baseness and dirtiness. // squalid slums // engaged in a series of squalid affairs

foul 1 of 2

adjective

ˈfau̇(-ə)l

Definition of foul

as in disgusting

causing intense displeasure, disgust, or resentment a foul taste that made us gag

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Antonyms & Near Antonyms

as in turbulent

marked by wet and windy conditions the foul weather brought out the windbreakers and rain slickers as everyone braced for a day of rough sailing

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as in unfair

not being in accordance with the rules or standards of what is fair in sport an aggressive hockey player who is known for his foul play and readiness for a fight

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as in obscene

depicting or referring to sexual matters in a way that is unacceptable in polite society that movie features nonstop foul language

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as in stinking

having an unpleasant smell the foul fumes from the paper mill

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as in filthy

not clean I wouldn't play in the foul rainwater that's collected in the feeding trough

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foul

2 of 2

verb

as in to dirty

to make dirty the mechanic fouled the bath towels with axle grease

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as in to pollute

to make unfit for use by the addition of something harmful or undesirable industrial pollution fouling the water supply

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Antonyms & Near Antonyms

as in to humiliate

to reduce to a lower standing in one's own eyes or in others' eyes the minister was irreparably fouled by baseless rumors and allegations

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as in to rot

to go through decomposition unless you want to smell the organic refuse as it fouls, locate the compost heap away from the house

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Synonym Chooser

How does the adjective foul differ from other similar words?

Some common synonyms of foul are dirty, filthy, nasty, and squalid. While all these words mean "conspicuously unclean or impure," foul implies extreme offensiveness and an accumulation of what is rotten or stinking; it can also describe, for example, loathsome behavior.

a foul-smelling open sewer

a foul story of lust and greed

When can dirty be used instead of foul?

Although the words dirty and foul have much in common, dirty emphasizes the presence of dirt more than an emotional reaction to it or, figuratively, stresses meanness or despicableness.

a dirty littered street

don't ask me to do your dirty work

When could filthy be used to replace foul?

The meanings of filthy and foul largely overlap; however, filthy carries a strong suggestion of offensiveness and typically of gradually accumulated dirt that begrimes and besmears. Figuratively, it can also describe disgusting obscenity.

a stained greasy floor, utterly filthy

filthy street language

How is nasty related to other words for foul?

Nasty applies to what is actually foul or is repugnant to one expecting freshness, cleanliness, or sweetness; in practice, however, nasty is often weakened to the point of being no more than a synonym of unpleasant or disagreeable. When used figuratively, nasty implies a peculiarly offensive unpleasantness.

it's a nasty job to clean up after a sick cat

had a nasty fall

his answer gave her a nasty shock

a stand-up comedian known for nasty humor

When would squalid be a good substitute for foul?

In some situations, the words squalid and foul are roughly equivalent. However, squalid adds to the idea of dirtiness and filth that of slovenly neglect. Distinctively, its figurative use implies sordidness as well as baseness and dirtiness.

squalid slums

engaged in a series of squalid affairs

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of foul

Adjective

The ripe salt-sea smell, raw and delicious and foul, that rose up from the platform and haunted the marsh for miles around, was today tamped down by the freshwater air blowing down from the north. — Literary Hub, 16 July 2026 Wilted cilantro is safe to eat but may lack flavor and texture; discard leaves that are slimy, discolored, or have a foul odor. — Heather Riske, Better Homes & Gardens, 16 July 2026

Verb

England’s penalty kick came after Malo Gusto fouled Djed Spence in the box. — Anthony Chiang, Miami Herald, 18 July 2026 In this case, hitters who were healthy might also have been wary that tailoring their swings to meet the Derby’s demands might foul them up for the second half. — Jim Alexander, Oc Register, 17 July 2026 See All Example Sentences for foul

Recent Examples of Synonyms for foul

Adjective

This is beyond disgusting, photos like this should be private.

— StyleCaster Editors, StyleCaster, 24 July 2026
His shirt was soaked down below his collarbones, clingy and disgusting.

— Literary Hub, Literary Hub, 22 July 2026

Definition of disgusting

Adjective

In the suit, WBD accuses Amazon of intentional interference with contractual relations; inducing breach of contract; intentional interference with prospective economic advantage; and unfair competition in violation of California law.

— Todd Spangler, Variety, 24 July 2026
If a judge found that Mora broke his agreement with the company, then a jury trial on the other issues of fraudulent misrepresentation, unfair business practices and breach of fiduciary duty may not be necessary, Mora said.

— Robert Rodriguez, Sacbee.com, 24 July 2026

Definition of unfair

Adjective

These stories were reprinted in Scottish and English botanical texts, and Henrietta would have known about the obscene ideas connected with the mushroom.

— Leah Hudson, Popular Science, 9 July 2026
Jackson then allegedly drove over into another lane and swerved at the victim, while using an obscene hand gesture.

— Kansas City Star, Kansas City Star, 7 July 2026

Definition of obscene

Adjective

America’s political landscape has become a stinking mess.

— Mary Ellen Klas, Boston Herald, 1 June 2026
Not the good, high-altitude ozone that shields us from dangerous UV light, but bad ozone, hovering right above ground level — stinking, brownish, grayish photochemical smog.

— Patt Morrison, Los Angeles Times, 26 Mar. 2026

Definition of stinking

Adjective

Dozens of people had spent almost a year living outside, filthy and exhausted, and for what?

— Literary Hub, Literary Hub, 10 July 2026
From shabby apartments to art experiments to filthy needles—with echoes of Patti Smith and Rebecca Makkai—Adler conjures an era of sorrow borne by too many, too young.

— Hamilton Cain, Time, 7 July 2026

Definition of filthy

Verb

Another study, published in Nature, found that Canadian wildfires in 2023, when more than 43 million acres burned, generated more emissions than the burning of fossil fuels in all but the three most-polluting countries.

— Joshua Partlow, The Atlantic, 16 July 2026
The same river that was savagely polluted by the mining industry, devastating the ancestral oasis of Quillagua.

— Cristina Dorador, The Dial, 14 July 2026

Definition of pollute

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“Foul.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foul. Accessed 27 Jul. 2026.

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