<p><strong>Adjective</strong></p><ul><li>grossly offensive to the senses; disgustingly loathsome; noisome: a foul smell.</li><li>containing or characterized by offensive or noisome matter: foul air; foul stagnant water.</li><li>filthy or dirty, as places, receptacles, clothes, etc.</li><li>muddy, as a road.</li><li>unfavorable or stormy: foul weather.</li><li>contrary, violent, or unfavorable, as the wind.</li><li>grossly offensive in a moral sense; abominable, wicked, or vile, as deeds, crime, slander, etc.</li><li>scurrilous, profane, or obscene; offensive: foul language.</li><li>contrary to the rules or established usages, as of a sport or game; unfair: a foul blow.</li><li>pertaining to a foul ball or a foul line.</li><li>limited in freedom of movement by obstruction, entanglement, etc.: a foul anchor.</li><li>abounding in errors or in marks of correction, as a printer's proof, manuscript, or the like.</li><li>(of the underwater portion of a hull) encrusted and impeded with barnacles, seaweed, etc.</li><li>(of a mooring place) involving inconveniences and dangers, as of colliding with vessels or other objects when swinging with the tide.</li><li>(of the bottom of a body of water) affording a poor hold for an anchor (clean).</li><li>not fair; ugly or unattractive.</li><li>obsolete; disfigured.</li></ul><p><strong>Adverb</strong></p><ul><li>in a foul manner; vilely; unfairly.</li></ul><p><strong>Noun</strong></p><ul><li>something that is foul.</li><li>a collision or entanglement: a foul between two racing sculls.</li><li>a violation of the rules of a sport or game: The referee called it a foul.</li><li>foul ball.</li></ul><p><strong>Verb</strong> (used with object)</p><ul><li>to make foul; defile; soil.</li><li>to clog or obstruct, as a chimney or the bore of a gun.</li><li>to collide with.</li><li>to cause to become entangled or caught, as a rope.</li><li>to defile; dishonor; disgrace: His reputation had been fouled by unfounded accusations.</li></ul><p><strong>Verb</strong> (used without object)</p><ul><li>to become foul.</li><li>to come into collision, as two boats.</li><li>to become entangled or clogged: The rope fouled.</li><li>to make a foul play; give a foul blow.</li><li>to hit a foul ball.</li></ul><p><strong>Verb Phrase</strong></p><ul><li>to cause confusion or disorder; bungle; spoil.</li><li>to be put out by hitting a foul ball caught on the fly by a player on the opposing team.</li><li>to be expelled from a game for having committed more fouls than is allowed.</li></ul>