Pronunciation

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Singular
foul

Plural
fouls

  1. (countable) Something that goes against the rules in a sport.
    After a bad foul, a soccer player has to leave the game

Adjective

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Positive
foul

Comparative
fouler

Superlative
foulest

  1. Bad, or having a bad smell.
    We left the meat too many days, and now it is foul and we can't eat it.
    There's a foul smell in the bathroom.