foul 1 of 2

adjective

ˈfau̇(-ə)l How to pronounce foul (audio)
Definition of foulnext
1
as in disgusting
causing intense displeasure, disgust, or resentment a foul taste that made us gag

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2
as in turbulent
marked by wet and windy conditions the foul weather brought out the windbreakers and rain slickers as everyone braced for a day of rough sailing

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3
as in unfair
not being in accordance with the rules or standards of what is fair in sport an aggressive hockey player who is known for his foul play and readiness for a fight

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4
as in obscene
depicting or referring to sexual matters in a way that is unacceptable in polite society that movie features nonstop foul language

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5
as in stinking
having an unpleasant smell the foul fumes from the paper mill

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6
as in filthy
not clean I wouldn't play in the foul rainwater that's collected in the feeding trough

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foul

2 of 2

verb

1
as in to dirty
to make dirty the mechanic fouled the bath towels with axle grease

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2
as in to pollute
to make unfit for use by the addition of something harmful or undesirable industrial pollution fouling the water supply

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3
as in to humiliate
to reduce to a lower standing in one's own eyes or in others' eyes the minister was irreparably fouled by baseless rumors and allegations

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4
as in to rot
to go through decomposition unless you want to smell the organic refuse as it fouls, locate the compost heap away from the house

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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 Valkyries’ coaching staff’s pleas to the officiating crew for a flagrant foul call were not successful. — Marisa Ingemi, Mercury News, 28 Aug. 2026 Black may follow black licorice or blueberries, though persistently dark, foul-smelling stool can point to intestinal or liver issues. — Hanna Wickes, Fort Worth Star-Telegram, 28 Aug. 2026
Verb
The Sox thought Smith had fouled the inside pitch off his bat. — Lamond Pope, Chicago Tribune, 1 Sep. 2026 In the fifth inning, Soto fouled a ball off his right leg, eliciting a grimace from him and attention from both an athletic trainer and Green. — Will Sammon, New York Times, 30 Aug. 2026 See All Example Sentences for foul
Recent Examples of Synonyms for foul
  1. disgusting
  2. turbulent
  3. unfair
  4. obscene
  5. stinking
  6. filthy
  7. dirty
  8. pollute
Adjective
  • There is real hope of a postseason push, with the disgusting state of the American League leaving the door open for any team that dares to play well.
    — Mitch Bannon, New York Times, 26 Aug. 2026
  • This whole situation is discriminatory, disgusting, and quite frankly, Orwellian.
    — Jon Root OutKick, FOXNews.com, 17 Aug. 2026
Definition of disgusting
Adjective
  • Prototype points toward larger trials To demonstrate the design, the researchers produced a marine buoy that remained stable in a turbulent seawater tank rotated up to 45 degrees.
    — Atharva Gosavi, Interesting Engineering, 3 Sep. 2026
  • The report from the Government Accountability Office found delays and holes in how the Secret Service updates its policies regarding threats, and arrives after a few turbulent years for the agency charged with the president’s protection.
    — Jesse Bedayn, Los Angeles Times, 3 Sep. 2026
Definition of turbulent
Adjective
  • In recent days, the United States proposed new terms that were uneconomic, unfair and undermine the net benefits for Canada, and called into question the reliability of any deal.
    — ABC News, ABC News, 30 Aug. 2026
  • And many of the 1970s nationalization of most major oil companies holdings in oil exporting nations were partly due to the sense that the original concession agreements were unfair.
    — Michael Lynch, Forbes.com, 30 Aug. 2026
Definition of unfair
Adjective
  • More than 3,000 shows and a sizable cult following later, The Dark Room has evolved into a choose-your-own-adventure live action video game, presided over by Robertson as its obscene, merciless and incredibly quick-witted host.
    — Rebecca Rosman, NPR, 31 Aug. 2026
  • The law is aimed at prohibiting children from obtaining books and movies with obscene content.
    — Joseph Flaherty, Arkansas Online, 28 Aug. 2026
Definition of obscene
Adjective
  • America’s political landscape has become a stinking mess.
    — Mary Ellen Klas, Boston Herald, 1 June 2026
  • 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
Definition of stinking
Adjective
  • People were filthy in so many ways, so Mike really wrote that in.
    — Ben Travers, IndieWire, 20 Aug. 2026
  • While sinks can become filthy from soap splatters and dirty hands, toilets need cleaning for very different reasons.
    — Karen Brewer Grossman, Southern Living, 17 Aug. 2026
Definition of filthy
Verb
  • Satisfy your lasagna craving without dirtying up a pile of dishes.
    — Kimberly Holland, Southern Living, 9 July 2026
  • The zipper shoe compartment keeps your shoes from dirtying up your clothing, and the massive interior can hold many outfits for your weekend getaway.
    — Olivia Dubyak, Travel + Leisure, 9 Mar. 2026
Definition of dirty
Verb
  • Environmental groups advocated for SB 954 over concerns that the CEQA exemption could allow heavily polluting facilities to bypass environmental review.
    — Naomi Taxay, Sacbee.com, 29 Aug. 2026
  • The usual analogy is that generative AI and LLMs are akin to a factory that pollutes local waters.
    — Lance Eliot, Forbes.com, 19 Aug. 2026
Definition of pollute

Phrases Containing foul

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fought shy of
foul
fouled
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Cite this Entry

“Foul.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foul. Accessed 5 Sep. 2026.

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More from Merriam-Webster on foul

Britannica.com: Encyclopedia article about foul

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