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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 third the Blue Jays loaded the bases on two walks and a single, and Anthony Santander pulled what would have been a grand slam just a couple of feet foul. Mac Cerullo, Boston Herald, 26 Sep. 2025 Guests will enjoy the experience free from disruptive behavior, foul language, obscene gestures, fighting, unruly conduct or inconsiderate actions. Ed Masley, AZCentral.com, 25 Sep. 2025
Verb
But drawing an over-aggressive, poor-technique personal foul on a 60-yard attempt for a guy trying a field goal 12 yards longer than any attempt in his career is akin to fouling a basketball player heaving a three-quarters court shot at the buzzer while trailing by two. Parker Gabriel, Denver Post, 15 Sep. 2025 Sporting was awarded the spot kick after a video review revealed Shapi Suleymanov had been fouled while dribbling in on goal. Daniel Sperry, Kansas City Star, 8 Sep. 2025 See All Example Sentences for foul
Recent Examples of Synonyms for foul
Adjective
  • Palace’s results this season are all the more impressive on the back of a turbulent summer that was totally overshadowed by the decisions made by UEFA and the Court of Arbitration for Sport to demote the club from the Europa League to the Conference League.
    Stuart James, New York Times, 29 Sep. 2025
  • While hundreds of people who were arrested went free without charge during that turbulent year, prosecutors are now pointing to those past protests in a warning to people who hope to send a message about ICE.
    Andy Rose, CNN Money, 28 Sep. 2025
Adjective
  • Specifically, the four customers argued that Hershey's violated Florida Deceptive And Unfair Trade Practices Act, which is designed to protect Floridians from unfair competition, deceptive acts and unethical practices.
    Greta Cross, USA Today, 26 Sep. 2025
  • The complaint accuses Dignity Health and the two hospitals of violating multiple laws including California’s Emergency Services Law, the Unruh Civil Rights Act, and unfair competition law.
    Nicole Nixon, Sacbee.com, 26 Sep. 2025
Adjective
  • Don’t notice all the ways humans are disgusting.
    Maureen Lee Lenker, Entertainment Weekly, 19 Sep. 2025
  • But this disgusting and hateful speech is still speech and is protected by our First Amendment.
    David Lightman, Sacbee.com, 18 Sep. 2025
Adjective
  • Banners or signs may not be commercial in nature or obscene, or cause any disturbance to other fans.
    Ed Masley, AZCentral.com, 25 Sep. 2025
  • Chiefs tight end Travis Kelce was docked $14,491 for making an obscene gesture after a big catch.
    Scott Thompson, FOXNews.com, 21 Sep. 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
  • Unitree claims that the G1 is made to handle difficult, filthy, and repetitive jobs in a variety of settings, including at homes, factories, and hospitals.
    Prabhat Ranjan Mishra, Interesting Engineering, 25 Sep. 2025
  • Josh O’Connor, at his filthy best, plays a disillusioned ’70s suburban dad married to Alana Haim and vaguely fathering a pair of pathologically chatty sons as the Vietnam War and its attendant protests color the world around them.
    Vulture Staff, Vulture, 23 Sep. 2025
Verb
  • At Dilara Findikoglu, models looked like ladies in waiting that had risen from the dead; wearing antiquated corsetry that was dirtied and torn.
    Leah Dolan, CNN Money, 23 Sep. 2025
  • 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
Verb
  • China’s is arguably the most important; whatever the world’s most-polluting country does will determine the planet’s climate trajectory.
    Ella Nilsen, CNN Money, 24 Sep. 2025
  • Transition finance, where financial firms actively pursue opportunities to fund polluting companies’ emissions reductions, has become a hot area.
    Justin Worland, Time, 23 Sep. 2025

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Cite this Entry

“Foul.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foul. Accessed 2 Oct. 2025.

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