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
In the sixth inning, Torrens’ sacrifice fly was a shallow one to first baseman Jake Burger in foul territory. — Jim Barnes, Fort Worth Star-Telegram, 23 Sep. 2026 Redness, open sores, discharge, foul-smelling ears, lumps or recurring skin issues all warrant a vet visit, not a grooming session. — Ryan Brennan, Charlotte Observer, 21 Sep. 2026
Verb
Tristan Peters fouled off 12 pitches in an 18-pitch at-bat that keyed Chicago's six-run outburst in the sixth inning and the White Sox beat the Cleveland Guardians 7-3 on Monday night to stay atop the AL Central. — CBS News, 15 Sep. 2026 The penalty was awarded early in the second half, with Brooks deciding that Sunderland’s Dan Ballard had been fouled by Arsenal defender Ezri Konsa. — Art De Roché, New York Times, 14 Sep. 2026 See All Example Sentences for foul
Recent Examples of Synonyms for foul
Adjective
  • The better to act out empire’s idea of what disgusting demonic sickness looks like.
    — Literary Hub, Literary Hub, 15 Sep. 2026
  • These guys are disgusting over the radio in the heat of battle.
    — Zach Dean OutKick, FOXNews.com, 7 Sep. 2026
Adjective
  • The vessel will navigate south through the narrow Strait of Malacca, round the turbulent waters of the Cape of Good Hope, and traverse the open expanse of the South Atlantic before dropping anchor off Bahia’s coast.
    — Mrigakshi Dixit, Interesting Engineering, 29 Sep. 2026
  • The unusual situation follows a turbulent stretch for CMS leadership.
    — Nora O'Neill, Charlotte Observer, 28 Sep. 2026
Adjective
  • Amid ongoing disputes that have rattled a city office at the center of complaints for months, a grievance is pending in which a worker claims unfair treatment, discrimination and that he was denied a deserved promotion.
    — Helen I. Bennett, Hartford Courant, 25 Sep. 2026
  • Some of that's going to be fair criticism, some of it's going to be unfair criticism.
    — Landon Mion, FOXNews.com, 24 Sep. 2026
Adjective
  • Current Florida law says a school district can review and remove a book after a complaint has been made that a book is pornographic, obscene or isn’t age appropriate.
    — Ana Goñi-Lessan, Sun Sentinel, 24 Sep. 2026
  • Created under O’Hare’s leadership, the 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, 22 Sep. 2026
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
Adjective
  • Jurors heard testimony from three of Alsheikh’s victims who said they were packed into small, filthy, cold, wet cells that were infested with insects and other vermin.
    — Brittny Mejia, Los Angeles Times, 19 Sep. 2026
  • That praise rings true more than a decade later thanks to joke after filthy joke, cameo after foul-mouthed cameo, scare after genuine scare.
    — Sara Netzley, Entertainment Weekly, 11 Sep. 2026
Verb
  • Satisfy your lasagna craving without dirtying up a pile of dishes.
    — Kimberly Holland, Southern Living, 9 July 2026
  • The zipper shoe compartment keeps your shoes from dirtying up your clothing, and the massive interior can hold many outfits for your weekend getaway.
    — Olivia Dubyak, Travel + Leisure, 9 Mar. 2026
Verb
  • Industrial animal agriculture confines and kills billions of animals while polluting waterways and damaging ecosystems.
    — Voice of the People, New York Daily News, 25 Sep. 2026
  • Instead, much of it is shipped off to the Global South to be repurposed and/or to pollute.
    — Emily Watlington, ARTnews.com, 24 Sep. 2026

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Cite this Entry

“Foul.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foul. Accessed 1 Oct. 2026.

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