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
Doncic made a 3 and another foul shot to lift Los Angeles to a 104-89 lead going into the fourth. CBS News, 27 Jan. 2026 Both foul poles are the deepest in baseball. Sahadev Sharma, New York Times, 26 Jan. 2026
Verb
Robertson was fouled by Oklahoma State’s Adrian Peterson while attempting an off-balance jumper at the buzzer. Kansas City Star, 30 Jan. 2026 Stirtz was fouled by USC's Jerry Easter II, and made both free throws to put Iowa back ahead. CBS News, 29 Jan. 2026 See All Example Sentences for foul
Recent Examples of Synonyms for foul
Adjective
  • Hearing disgusting lies spread about my brother is absolutely gut-wrenching, and my family is deeply grateful so many people have stood up and helped tell his truth.
    Drake Bentley, jsonline.com, 30 Jan. 2026
  • At one point a couple of years ago, Microsoft even used malware-like pop-ups in a disgusting overreach.
    Tom Warren, The Verge, 29 Jan. 2026
Adjective
  • Described as more of a tonal companion to The Worm than a direct continuation, The Answerers is equal parts existential thriller and absurdist comedy, exploring belief, delusion and the human need for meaning in an increasingly turbulent modern world.
    Glenn Garner, Deadline, 30 Jan. 2026
  • One analyst argues that Bitcoin could sink even more, given the turbulent macroeconomic environment.
    Carlos Garcia, Fortune, 30 Jan. 2026
Adjective
  • Two animal rights groups had sued C5 Rodeo and the Padres, alleging unfair business practices.
    Teri Figueroa, San Diego Union-Tribune, 29 Jan. 2026
  • For years, allegations have swirled that Kim manipulated stocks between 2010 and 2012 related to Korean BMW dealership Deutsch Motors, earning unfair profits.
    Jessie Yeung, CNN Money, 28 Jan. 2026
Adjective
  • Not only are hospital CEOs paid obscene amounts of money and the hospitals are sitting on fat cash balances, but NewYork–Presbyterian is guilty of something even more grotesque.
    Voice of the People, New York Daily News, 27 Jan. 2026
  • Some made obscene gestures, and one held up a paper cursing the president.
    Josh Boak, Los Angeles Times, 21 Jan. 2026
Adjective
  • Four plays, 76 yards, in 25 stinking seconds.
    David Aldridge, New York Times, 12 Oct. 2025
  • This is about a team with a top-10 payroll whose GM committed too stinking much of it to dogs that can’t, or won’t, pull the sled.
    Sean Keeler, The Denver Post, 22 Dec. 2019
Adjective
  • Sauron was bested by some filthy Hobbitses and their pal, Gollum.
    Erik Kain, Forbes.com, 22 Jan. 2026
  • Slightly less filthy than the ones on the balcony, those bricks could have used a coat of paint.
    Literary Hub, Literary Hub, 22 Jan. 2026
Verb
  • The adventurous actress dirties up her frock and face to play the village pariah, who reeks of fish and would be no man’s idea of a suitable wife, except perhaps the one-eyed bum who sleeps in the town square.
    Peter Debruge, Variety, 26 Jan. 2026
  • When stormwater dirtied by road runoff, failing septic tanks and fertilizer sullied crystal-clear rivers and lakes, and nobody cared.
    Orlando Sentinel Editorial Board, The Orlando Sentinel, 11 Jan. 2026
Verb
  • In November, detainees at the facility sued, alleging the facility is polluted by sewage leaks and insect infestations, and that detainees can’t get proper medical attention for life-threatening conditions.
    CalMatters, Oc Register, 21 Jan. 2026
  • First of all, most batteries contain cobalt, nickel, manganese, and other heavy metals that can be potentially toxic, and keeping them out of landfills ensures that these metals don’t leech out and pollute drinking water or the natural environment.
    Katherine Gallagher, Treehugger, 20 Jan. 2026

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Cite this Entry

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

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