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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
The other is a red panda named Bad Rudi with a penchant for foul language. Elizabeth Robinson, NBC news, 16 July 2025 His swing is quick and straight to the ball from both sides of the plate, and his power is foul pole to foul pole. Jim Bowden, New York Times, 11 July 2025
Verb
The Boston bats fouled off countless pitches, including at least half a dozen into the open windows of the press box, but the big hit eluded them. Gabrielle Starr, Boston Herald, 12 July 2025 Benjamin Pavard #28 of FC Internazionale Milano reacts as he is fouled by Lucas Ocampos #29 with Jorge Rodríguez #30 during the FIFA Club World Cup 2025 group E match between CF Monterrey and FC Internazionale Milano at Rose Bowl Stadium on June 17, 2025 in Pasadena, California. Kilty Cleary, MSNBC Newsweek, 21 June 2025 See All Example Sentences for foul
Recent Examples of Synonyms for foul
Adjective
  • Sheckler and Kells have used the parallels in their turbulent journeys in the spotlight to lean on one another, making their bond stronger over the years.
    Michael Saponara, Billboard, 14 Aug. 2025
  • By unifying intelligence, manufacturers can run simulations, identify vulnerabilities, and respond proactively—protecting digital and sustainability gains even in turbulent periods.
    Forbes.com, Forbes.com, 13 Aug. 2025
Adjective
  • Utility commissioners ruled in favor of power companies, which argued that older versions of the program created an unfair cost burden on customers.
    CalMatters, Mercury News, 7 Aug. 2025
  • Union employees at Stillwater Medical Group have reached a tentative agreement with HealthPartners, just two days after voting to authorize another unfair labor practices strike.
    Mary Divine, Twin Cities, 7 Aug. 2025
Adjective
  • Kruse and her co-conspirators are now on their fourth different set of lawyers in this dispute, and this is a disgusting publicity stunt by new counsel, as evidenced by the fact that the complaint and press release were sent to the press before the complaint was served.
    Michaela Zee, Variety, 13 Aug. 2025
  • The series sets the various human and humanoid segments of its cast on a direct course with the distinctly inhuman alien flora and fauna on the ship – there are some inventive little monsters aboard, disgusting and harrowing in their own special ways – to great effect.
    Kelly Lawler, USA Today, 12 Aug. 2025
Adjective
  • To authenticate Trump's note and the obscene drawing that accompanied it, Journal reporters claim to have seen the album and talked to people knowledgeable about it.
    Thomas G. Moukawsher, MSNBC Newsweek, 11 Aug. 2025
  • Guests will enjoy the experience free from disruptive behavior, foul language, obscene gestures, fighting, unruly conduct or inconsiderate actions.
    Ed Masley, AZCentral.com, 9 Aug. 2025
Adjective
  • 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
  • Muttaiah said the man inside the stinking manhole was working without any safety equipment — no gloves, no shoes, no supplemental oxygen.
    Joanna Slater, Washington Post, 16 Dec. 2019
Adjective
  • Williams was downright filthy from May 7 through the end of June, posting a 1.45 ERA.
    Gary Phillips, New York Daily News, 5 Aug. 2025
  • The kitten was in a sad condition: overheated, wounded, filthy, and covered in fleas and feces.
    Alice Gibbs, MSNBC Newsweek, 27 July 2025
Verb
  • As more success suddenly comes his way, McKinstry has remained the same, friendly and chuckling at his locker, dirtying his jersey and pestering opponents on the field.
    Cody Stavenhagen, New York Times, 10 July 2025
  • Some were prosthetic buttocks, but others were people’s own buttocks, but in various states, like dirtied down and with partial covering.
    Alex Ritman, Variety, 1 July 2025
Verb
  • Flea Treatment Market Is Ripe For Innovation Though safer options exist, companies should innovate to find more solutions that protect our pets without polluting the planet.
    Arlene Blum, Forbes.com, 31 July 2025
  • The other is synthetic, manmade, utilitarian and crumbles within decades but pollutes the environment forever.
    Christian Zilko, IndieWire, 29 July 2025

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Cite this Entry

“Foul.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foul. Accessed 20 Aug. 2025.

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