Definition of foulnext
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foul

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verb

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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
And then in the third, borderline, foul-ball homer right there. Chad Bishop, AJC.com, 28 June 2026 Still, Devers got enough barrel on the ball to pull it down the right-field line and clank it off the foul pole, winning free chicken for those in attendance. Justice Delos Santos, Mercury News, 28 June 2026
Verb
Surviving quality work by King in the nine-pitch duel, Freeman fouled off three different types of full-count pitches. Tom Krasovic, San Diego Union-Tribune, 28 June 2026 Arraez fouled a ball off the top of his right foot in the bottom of the first inning on Tuesday, immediately dropping to the ground in pain but ultimately staying in the game. Justice Delos Santos, Mercury News, 25 June 2026 See All Example Sentences for foul
Recent Examples of Synonyms for foul
Adjective
  • French broadcaster French Pierron was under fire for calling childbirth 'a disgusting moment.
    Emlyn Travis, Entertainment Weekly, 22 June 2026
  • How to make the moment scary but watchable, disgusting but entrancing?
    David Denby, New Yorker, 21 June 2026
Adjective
  • Directed by Guadagnino from a screenplay by Saturday Night Live alum Simon Rich, Artificial explores Sam Altman’s OpenAI and the company’s turbulent period in 2023 when he was fired and rehired in a matter of days.
    Glenn Garner, Deadline, 26 June 2026
  • The trauma of a turbulent household had aged her beyond her years.
    Latif Love June 26, Kansas City Star, 26 June 2026
Adjective
  • His conviction was overturned in 2024 when his lawyers argued the first trial was unfair when the court allowed other accusers to testify.
    Bethy Squires, Vulture, 26 June 2026
  • Hilton, running on a platform of affordability and lowering taxes, has seized on the sentiment, casting health coverage for immigrants without legal status as deeply unfair and a direct threat to the state’s ability to help citizens.
    Christine Mai-Duc, Los Angeles Times, 26 June 2026
Adjective
  • Counterculture Yippies would turn up at a 1970 Blood, Sweat & Tears show at Madison Square Garden, carrying obscene banners outside and dumping manure by the front gate.
    Hillel Italie, Los Angeles Times, 26 June 2026
  • Yippies would turn up at a 1970 Blood, Sweat & Tears show at Madison Square Garden, carrying obscene banners outside and dumping manure by the front gate.
    ABC News, ABC News, 25 June 2026
Adjective
  • America’s political landscape has become a stinking mess.
    Mary Ellen Klas, Boston Herald, 1 June 2026
  • America’s political landscape has become a stinking mess.
    Mary Ellen Klas, Mercury News, 26 May 2026
Adjective
  • Margera tried to soothe the pain by submerging his fresh brand in a tub of filthy farm water, which resulted in a life-threatening staph infection that landed him in the hospital.
    Sezin Devi Koehler, Entertainment Weekly, 26 June 2026
  • Outside the Lineage warehouse Thursday morning, the smell of heavy smoke was already being replaced with that of spoiling food and filthy water.
    Alex Wigglesworth, Los Angeles Times, 25 June 2026
Verb
  • The spoon even comes with measuring lines for a teaspoon and tablespoon, saving you from having to dirty another utensil.
    Melanie Fincher, Southern Living, 26 June 2026
  • But as filming continued, Pidgeon appeared to dirty her butter blond with caramel and chocolate shades similar to Bessette-Kennedy’s, thanks to stylist Kari Hill.
    Kaleigh Werner, Footwear News, 25 Feb. 2026
Verb
  • The solution is to support federal and state legislation that encourages lower-cost, less-polluting renewable energy to speed up the transition away from environmentally damaging fossil fuels.
    Chicago Tribune, Chicago Tribune, 29 June 2026
  • Plastics degrade into microplastics, which in humans have been linked to cancer, reproductive problems, and other health issues, and which are polluting ecosystems from coral reefs to Antarctica.
    Veronique Greenwood, Time, 26 June 2026

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Cite this Entry

“Foul.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foul. Accessed 3 Jul. 2026.

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