foul

(noun) an act that violates the rules of a sport.

(verb) hit a foul ball.

(verb) make impure. Synonyms: pollute, contaminate. Examples: "The industrial wastes polluted the lake."

(verb) become or cause to become obstructed. Synonyms: clog, choke off, clog up, back up, congest, choke. Examples: "The leaves clog our drains in the fall." "The water pipe is backed up."

(verb) commit a foul; break the rules.

(verb) spot, stain, or pollute. Synonyms: befoul, defile, maculate. Examples: "The townspeople defiled the river by emptying raw sewage into it."

(verb) make unclean. Examples: "Foul the water."

(verb) become soiled and dirty.

(adj) highly offensive; arousing aversion or disgust. Synonyms: disgusting, disgustful, distasteful, loathly, loathsome, repellent, repellant, repelling, revolting, skanky, wicked, yucky. Examples: "A disgusting smell." "Distasteful language." "A loathsome disease." "The idea of eating meat is repellent to me." "Revolting food." "A wicked stench."

(adj) offensively malodorous. Synonyms: fetid, foetid, foul-smelling, funky, noisome, smelly, stinking, ill-scented. Examples: "A foul odor." "The kitchen smelled really funky."

(adj) violating accepted standards or rules. Synonyms: cheating(prenominal), dirty, unsporting, unsportsmanlike. Examples: "A dirty fighter." "Used foul means to gain power." "A nasty unsporting serve." "Fined for unsportsmanlike behavior."

(adj) (of a baseball) not hit between the foul lines. Synonyms: foul (vs. fair).

(adj) (of a manuscript) defaced with changes. Synonyms: dirty, marked-up. Examples: "Foul (or dirty) copy."

(adj) characterized by obscenity. Synonyms: cruddy, filthy, nasty, smutty. Examples: "Had a filthy mouth." "Foul language." "Smutty jokes."

(adj) disgustingly dirty; filled or smeared with offensive matter. Synonyms: filthy, nasty. Examples: "As filthy as a pigsty." "A foul pond." "A nasty pigsty of a room."

(adj) especially of a ship's lines etc. Synonyms: afoul(postnominal), fouled. Examples: "With its sails afoul." "A foul anchor."