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

During Game 4 of the 2024 World Series, two fans essentially tried to rip a ball out of the glove of Dodgers right fielder Mookie Betts in foul territory — those two were indefinitely banned from all MLB stadiums. — James O'Connell, New York Daily News, 8 Oct. 2026 The foul call was part of a larger shift by the NBA, which has changed its officiating approach toward the use of the off arm this season. — Julia Poe, Chicago Tribune, 8 Oct. 2026

Verb

Batting in the bottom of the third with two outs against Reds starter Brandon Williamson, Acuña swung at a 3-1 cutter and fouled the pitch off his left leg near the shin area. — Chad Bishop, AJC.com, 23 Sep. 2026 Long is on Zoom, from her home in Los Angeles and seated at her kitchen counter with the sliding doors behind her, where a custodian is cleaning the deck that coyotes keep fouling. — Clayton Davis, Variety, 16 Sep. 2026 See All Example Sentences for foul

Recent Examples of Synonyms for foul

Adjective

That’s likely to inspire either affection or immediate exhaustion, depending on your fondness for the infamously disgusting performance group.

— Alison Foreman, IndieWire, 8 Oct. 2026
People tend to think of waste as trash, sewage, slag, manure and other seemingly useless or disgusting substances.

— Edward D. Melillo, The Conversation, 30 Sep. 2026

Definition of disgusting

Adjective

Still, Saudi Arabia has viewed attendance at the event, and general support for the Gulf during turbulent times, as a loyalty test for global business leaders.

— Liz Hoffman, semafor.com, 19 Oct. 2026
Zacharia’s time in China was just one of her career highlights that triggered intense media scrutiny following her brief and turbulent appointment as White House press secretary.

— John Liu, CNN Money, 17 Oct. 2026

Definition of turbulent

Adjective

International rights groups have repeatedly criticized the detention and, in some cases, execution of people after unfair trials.

— ABC News, ABC News, 14 Oct. 2026
Murmurs about the power of politicians and unfair advantages of the rich were heard as participants warmed up to each other.

— Lina Abascal, Los Angeles Times, 14 Oct. 2026

Definition of unfair

Adjective

Another bemoaned the amount of money spent on Marsh’s NIL deal, using similar obscene language.

— Dana O’Neil, CNN Money, 17 Oct. 2026
The disingenuous campaign ads, the obscene amount of money that is spent to air them and the promises that are rarely fulfilled are enough to make one cynical.

— Cal Thomas, Arkansas Online, 6 Oct. 2026

Definition of obscene

Adjective

For this argument Thomasine was jailed—stuffed into a damp, stinking, deadly stone cell crawling with rats and lice—to force her to change her beliefs.

— Literary Hub, Literary Hub, 28 Sep. 2026
America’s political landscape has become a stinking mess.

— Mary Ellen Klas, Boston Herald, 1 June 2026

Definition of stinking

Adjective

Some orphans, their faces filthy, walked the stands hawking candy.

— Dexter Filkins, New Yorker, 14 Oct. 2026
Myriad violations, from food that should’ve been trashed weeks earlier to filthy equipment, befouled the state inspection of a West Miami-Dade supermarket this week.

— David J. Neal, Miami Herald, 11 Oct. 2026

Definition of filthy

Verb

In a world riven by democratic backsliding and polluted with AI slop, there’s something seductive about the idea of retreating to a wild, unnavigable place where no one can follow you—because you’ll be submerged up to your eyeballs.

— Literary Hub, Literary Hub, 15 Oct. 2026
Throwing a piece of garbage out of the window affects every Texan, polluting water and soil and affecting wildlife.

— Katie Standing, CBS News, 14 Oct. 2026

Definition of pollute

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“Foul.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foul. Accessed 21 Oct. 2026.

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