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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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

Jonathan Bowlan allowed a single and a walk in the eighth before escaping with help from Brandon Marsh’s catch of a foul pop amid the fans in left field. — Miami Herald, 20 Aug. 2026 Unlike with the Automated Ball/Strike system, Hawk-Eye data above the foul pole is unlikely to be accurate that far from the field. — ABC News, 20 Aug. 2026

Verb

Báez worked a full count in the fourth inning, fouling off a first-pitch changeup and taking another two pitches later for a ball. — Andy Martinez, Chicago Tribune, 16 Aug. 2026 At the end, the Liberty prevailed as the Sparks intentionally fouled to stay in the game, getting clutch makes by Ionescu. — Fiifi Frimpong, New York Daily News, 14 Aug. 2026 See All Example Sentences for foul

Recent Examples of Synonyms for foul

Adjective

There is real hope of a postseason push, with the disgusting state of the American League leaving the door open for any team that dares to play well.

— Mitch Bannon, New York Times, 26 Aug. 2026
This whole situation is discriminatory, disgusting, and quite frankly, Orwellian.

— Jon Root OutKick, FOXNews.com, 17 Aug. 2026

Definition of disgusting

Adjective

In recent days, the United States proposed new terms that were uneconomic, unfair and undermine the net benefits for Canada, and called into question the reliability of any deal.

— ABC News, ABC News, 30 Aug. 2026
And many of the 1970s nationalization of most major oil companies holdings in oil exporting nations were partly due to the sense that the original concession agreements were unfair.

— Michael Lynch, Forbes.com, 30 Aug. 2026

Definition of unfair

Adjective

The Tarrant County decorum policy prohibits personal attacks, impertinent, profane, obscene, or slanderous remarks as well as threatening, disruptive or unruly behavior.

— Rachel Royster, Fort Worth Star-Telegram, 24 Aug. 2026
Starks said the obscene gesture was meant as a joke to teammates.

— Chris Perkins, Sun Sentinel, 24 Aug. 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

Verb

Environmental groups advocated for SB 954 over concerns that the CEQA exemption could allow heavily polluting facilities to bypass environmental review.

— Naomi Taxay, Sacbee.com, 29 Aug. 2026
The usual analogy is that generative AI and LLMs are akin to a factory that pollutes local waters.

— Lance Eliot, Forbes.com, 19 Aug. 2026

Definition of pollute

Cite this Entry

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“Foul.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foul. Accessed 2 Sep. 2026.

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