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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
Edman then came up with one out in the fifth and went the other way against Joel Peguero (3-1), hitting the ball off the left-field foul pole for another solo home run and a 5-4 lead. Dan Arritt, Oc Register, 21 Sep. 2025 The body was discovered in the Tesla trunk after police were called to a tow yard in Hollywood to investigate reports of a foul smell coming from the car. Jon Blistein, Rolling Stone, 19 Sep. 2025
Verb
In the first inning as the Blue Jays wore down the Yankees by putting balls in play and fouling off pitches, Judge was tested for the first time on a single by Nathan Lukes. Larry Fleisher, Forbes.com, 7 Sep. 2025 Matters only got more bleak in the sixth, when Rushing fouled a ball off his right shin, smoking a ball right above where his guard ended and immediately going down in pain. Fabian Ardaya, New York Times, 6 Sep. 2025 See All Example Sentences for foul
Recent Examples of Synonyms for foul
Adjective
  • Giant chronicles a turbulent time in the life of famed children’s author Dahl when he was accused of anti-Semitism in the early 1980s.
    Greg Evans, Deadline, 16 Sep. 2025
  • As the biomaterials space navigates a more turbulent landscape marked by tightening budgets, regulatory uncertainty, and investor caution, Biofabricate is adapting its approach.
    Rhonda Richford, Footwear News, 16 Sep. 2025
Adjective
  • That has raised questions from fans—and executives around the league—over whether Brady can fairly handle both responsibilities, or whether his access as broadcaster could give Las Vegas an unfair advantage.
    Jacob Feldman, Sportico.com, 21 Sep. 2025
  • On Thursday, the Actors’ Equity Association, which represents Casa Bonita’s unionized performers, filed an unfair labor practice charge with the National Labor Relations Board due to changes with the cast.
    Tiney Ricciardi, Denver Post, 19 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
  • Guests will enjoy the experience free from disruptive behavior, foul language, obscene gestures, fighting, unruly conduct or inconsiderate actions.
    Ed Masley, AZCentral.com, 20 Sep. 2025
  • Other users called her obscene names, threatened to show up at her workplace, or sent her a photograph of guns.
    Quinn Clark, jsonline.com, 16 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
  • Grab a sponge and a bucket, some vinegar, and dish soap, and scrub away that filthy grime.
    Karen Brewer Grossman, Southern Living, 19 Sep. 2025
  • Nothing sends chills down your spine like evil clowns, undead monsters and a filthy car.
    Charlie Vargas, Oc Register, 12 Sep. 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
  • The people affected by environmental violations are not just the nearby community, Duggan said, but the workers at polluting facilities as well.
    Taylor Kate Brown, ProPublica, 17 Sep. 2025
  • Rivian also faces opposition from some residents who say the plant is an inappropriate neighbor to farms and will pollute the groundwater.
    Preston Fore, Fortune, 16 Sep. 2025

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Cite this Entry

“Foul.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foul. Accessed 23 Sep. 2025.

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