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
There was no harm, no foul, however. Doug Kyed, Boston Herald, 12 Jan. 2026 Jayden Stone made two separate trips to the line after Mitchell’s go-ahead shot, making all four foul shots to secure the win. Maddie Hartley, Kansas City Star, 8 Jan. 2026
Verb
Dunn made a layup with 31 seconds left in the third quarter and was fouled in the process. Haley Sawyer, Oc Register, 7 Jan. 2026 Miles Heide, who grabbed the rebound, scored before the shot clock expired and was fouled. Mark Zeigler, San Diego Union-Tribune, 7 Jan. 2026 See All Example Sentences for foul
Recent Examples of Synonyms for foul
Adjective
  • The medical ordeals are traumatic and disgusting, but fascinating and full of the quirks of modern life.
    Kelly Lawler, USA Today, 8 Jan. 2026
  • Having snow, slush, and (eventually) water all over my floors was a disgusting feeling.
    Natalia Gonzalez Blanco Serrano, The Spruce, 7 Jan. 2026
Adjective
  • Use extra caution near the surf zone as these large waves will be capable of sweeping people into the frigid and turbulent ocean water.
    CA Weather Bot, Sacbee.com, 7 Jan. 2026
  • The story of the Platonic representation hypothesis paper began in early 2023, a turbulent time for AI researchers.
    Ben Brubaker, Quanta Magazine, 7 Jan. 2026
Adjective
  • On December 31, the unions filed with the State of California, alleging unfair labor practices by Solano County and arguing that Solano is not bargaining in good faith.
    Ashley Sharp, CBS News, 13 Jan. 2026
  • But for Brody, the political strategist who surfaced the Maduro trade, the latest episode is just another example of the unfair nature of the financial system.
    Leo Schwartz, Fortune, 12 Jan. 2026
Adjective
  • Indonesia, with the world’s biggest Muslim population, has strict rules that ban the sharing online of content deemed obscene.
    Reuters, NBC news, 10 Jan. 2026
  • Sylvie's storylines are ridiculous, her wardrobe obscene, her audacity unparalleled.
    Sam Reed, Glamour, 6 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
  • So many downtown buildings and parking areas are filthy, smelling of urine and unmaintained.
    U T Readers, San Diego Union-Tribune, 12 Jan. 2026
  • Merry Christmas ya filthy animals.
    Virginia Chamlee, PEOPLE, 26 Dec. 2025
Verb
  • 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
  • Keep them in reserve as a sleep sock to ward off icy toes and prevent sweat and skin oils from dirtying your down sleeping bag.
    Adam Roy, Outside, 28 Dec. 2025
Verb
  • Despite the cesspits of conspiracy-think that pollute contemporary politics, the specific paranoia of Letts’s characters — bugs under the skin, brainwashing, nefarious doctors in government labs — feels less blazingly relevant than comparatively quaint.
    Sara Holdren, Vulture, 9 Jan. 2026
  • Chemical rockets put out huge plumes of polluting exhaust, and for a massive machine like the SpaceX Starship, with 33 first-stage engines, that can add up—especially with hundreds of launches planned.
    Jeffrey Kluger, Time, 7 Jan. 2026

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Cite this Entry

“Foul.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foul. Accessed 15 Jan. 2026.

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