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
Every foul won is celebrated like a goal. Franklin Leonard, Vanity Fair, 14 May 2026 Additionally, prevent any foul odors or mildew from forming by leaving the dishwasher door slightly open to allow for good ventilation. Maria Sabella, Better Homes & Gardens, 13 May 2026
Verb
Mitchell scored, was fouled by Smart and made the free throw for a three-point play and a 95-92 Thunder lead. Broderick Turner, Los Angeles Times, 12 May 2026 France took a ball, swung through a fastball, took another ball and then fouled off two pitches before watching a ball in the dirt. Kevin Acee, San Diego Union-Tribune, 7 May 2026 See All Example Sentences for foul
Recent Examples of Synonyms for foul
Adjective
  • How on Earth could this Wild team, after dominating the first period and taking a 3-0 lead with a chance to keep its season alive and force a Game 6, collapse in such an absolutely disgusting fashion?
    Michael Russo, New York Times, 14 May 2026
  • Just days ago, the CDC announced that over 100 passengers and more than a dozen crew members on a different ship, the Caribbean Princess, have been infected by norovirus—a less fatal but more disgusting illness.
    Hillary Busis, Vanity Fair, 11 May 2026
Adjective
  • Inside, another naked woman on a Jet Ski does circles in a turbulent body of water.
    Sebastian Smee, The Atlantic, 16 May 2026
  • The shift has direct market implications, Dalio said, as investors must navigate a turbulent period where currency values face risk and uncertainty demands liquidity and diversification including gold.
    David Westin, Fortune, 16 May 2026
Adjective
  • Bonta pushes back against FIFA ticketing practices In his Wednesday letter to the federation, Bonta emphasized California’s consumer protection laws against unfair competition and false advertising.
    Camila Pedrosa, Sacbee.com, 14 May 2026
  • But Oklahoma City has raised the standard to an almost unfair level.
    Mike Bianchi, The Orlando Sentinel, 14 May 2026
Adjective
  • If this obscene gerrymander survives, the next one will purge what little remains of Democratic representation in the Legislature, where the GOP holds massive supermajorities far beyond its share of the electorate.
    Sun Sentinel Editorial Board, Sun Sentinel, 11 May 2026
  • He was also given a third charge involving obscene material and minors, according to jail records.
    Devoun Cetoute, Miami Herald, 9 May 2026
Adjective
  • Not the good, high-altitude ozone that shields us from dangerous UV light, but bad ozone, hovering right above ground level — stinking, brownish, grayish photochemical smog.
    Patt Morrison, Los Angeles Times, 26 Mar. 2026
  • Their solution to a stinking run was, comically, to rely on less than 23 per cent of possession and pick Madrid off with a classy volley from Martin Satriano, below.
    Phil Hay, New York Times, 3 Mar. 2026
Adjective
  • Inside, filthy soldiers press up against the wood.
    Eliana Dockterman, Time, 12 May 2026
  • Baker said while Fike's immediate surroundings were filthy, a brand-new hospital bed, urinal and wheelchair were available at the home.
    Madeline Bartos, CBS News, 7 May 2026
Verb
  • But as filming continued, Pidgeon appeared to dirty her butter blond with caramel and chocolate shades similar to Bessette-Kennedy’s, thanks to stylist Kari Hill.
    Kaleigh Werner, Footwear News, 25 Feb. 2026
  • With the help of your Instant Pot, spaghetti and meatballs come together in under an hour without dirtying multiple dishes.
    Jenna Sims, Southern Living, 24 Feb. 2026
Verb
  • See, scientists know human drugs pollute aquatic environments – past studies have shown even anti-anxiety drugs can change how fish act.
    Regina G. Barber, NPR, 12 May 2026
  • Toilet paper, a product that is used for a few seconds before being disposed of forever, is typically made with trees, energy-intensive manufacturing processes and chemicals that can pollute the environment.
    Los Angeles Times, Los Angeles Times, 10 May 2026

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Cite this Entry

“Foul.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foul. Accessed 19 May. 2026.

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