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foul has 42 distinct synonyms spread across 10 of its 16 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is fair.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
highly offensive; arousing aversion or disgust
“a disgusting smell”
offensively malodorous
“a foul odor”
violating accepted standards or rules
“a dirty fighter”
(of a baseball) not hit between the foul lines
an act that violates the rules of a sport
Synonyms, antonyms and the broader and narrower relations for foul come from Princeton University’s WordNet. Full sources and licences.