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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 Rangers had two runners on with one out in the third inning when Texas’ Ezequiel Duran popped up a pitch on the foul side of the third-base line. Pete Grathoff, Kansas City Star, 21 Aug. 2025 If your dirty or foul clothes simply can’t wait, try these options for washing on the go. Kathy Barnes, Better Homes & Gardens, 18 Aug. 2025
Verb
But Teoscar Hernandez swung and missed at two fastballs down the middle, fouled off one slider then chased another one into the dirt of the left-hand batter’s box. Bill Plunkett, Oc Register, 9 Aug. 2025 Soto, being evaluated daily, departed the game in the fourth inning after fouling a pitch off the top of his back foot. Tim Britton, New York Times, 30 July 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
  • The two were married in 2012, and in the 13 years that followed, Krein was spotted from time to time with the powerful political family as his father-in-law navigated a presidential campaign and turbulent term in the White House.
    Kyler Alvord, People.com, 13 Aug. 2025
Adjective
  • That blame might be unfair; Trump’s tariffs and a national immigration crackdown, which are surely affecting demand and hiring, aren’t Powell’s doing.
    Jon Hilsenrath, semafor.com, 21 Aug. 2025
  • Minnesota is seeking a declaration that TikTok’s practices are deceptive, unfair or unconscionable under state law, a permanent injunction against those practices, and up to $25,000 for each instance in which a Minnesota child has accessed TikTok.
    Nick Lichtenberg, Fortune, 20 Aug. 2025
Adjective
  • One of the guests makes a disgusting joke involving the boat and lubricant.
    Rafaela Bassili, Vulture, 26 Aug. 2025
  • Leftovers on a plate are more disgusting than leftovers in a pot, and leftovers on someone else’s plate more disgusting still.
    Rafil Kroll-Zaidi, Harpers Magazine, 20 Aug. 2025
Adjective
  • Part of that obscene number is the Never Say Die Ladies Turf Sprint.
    Danny Brewer, Forbes.com, 24 Aug. 2025
  • Brooklyn prosecutors charged him with misdemeanor assault, as well as menacing, reckless endangerment, possession of obscene material, interference with a professional sporting event, weapons possession and other charges, officials said.
    Thomas Tracy, New York Daily News, 21 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
  • Trump has repeatedly described some of the nation's largest cities, run by Democrats, with Black mayors and majority-minority populations, as dangerous and filthy.
    Martha McHardy, MSNBC Newsweek, 23 Aug. 2025
  • While the exterior appears to be filthy, images from inside appear to show a white substance covering the steering wheel, dashboard, center console and other parts of the interior.
    Michael Ruiz, FOXNews.com, 23 Aug. 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
  • It’s only been a couple of years since AI songs first started polluting the web, but audio generators like Suno and Udio have improved in subtle yet meaningful ways, simulating human imperfections and quirks more effectively.
    Kieran Press-Reynolds, Pitchfork, 14 Aug. 2025
  • The old East German factories, which once dumped chemicals into the river, stopped polluting almost overnight.
    Christopher Elliott, Forbes.com, 11 Aug. 2025

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Cite this Entry

“Foul.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foul. Accessed 3 Sep. 2025.

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