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Definition of foul
foul - adj. (of a baseball) not hit between the foul lines; especially of a ship's lines etc; disgustingly dirty; filled or smeared with offensive matter; characterized by obscenity; violating accepted standards or rules; offensively malodorous; (of a manuscript) defaced with changes; highly offensive; arousing aversion or disgust; noun an act that violates of the rules of a sport; verb become soiled and dirty; make unclean; spot, stain, or pollute; commit a foul; break the rules; hit a foul ball; make impure; become or cause to become obstructed.
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