Definition of "Foul" :

noun: an act that violates the rules of a sport

verb: become soiled and dirty

verb: make unclean

"Foul the water."

verb: spot, stain, or pollute

verb: make impure

verb: commit a foul; break the rules

verb: hit a foul ball

verb: become or cause to become obstructed

adjective: especially of a ship's lines etc

"With its sails afoul."

adjective: disgustingly dirty; filled or smeared with offensive matter

"A foul pond."

adjective: characterized by obscenity

"Foul language."

adjective: (of a baseball) not hit between the foul lines

adjective: violating accepted standards or rules

"Used foul means to gain power."

adjective: offensively malodorous

"A foul odor."

adjective: (of a manuscript) defaced with changes

"Foul (or dirty) copy."

adjective: highly offensive; arousing aversion or disgust