foul

highly offensive; arousing aversion or disgust

• “a disgusting smell”
• “distasteful language”
• “a loathsome disease”
• “the idea of eating meat is repellent to me”
• “revolting food”
• “a wicked stench”

offensively malodorous

• “a putrid smell”

violating accepted standards or rules

• “a dirty fighter”
• “used foul means to gain power”
• “a nasty unsporting serve”
• “fined for unsportsmanlike behavior”

(of a baseball) not hit between the foul lines

(of a manuscript) defaced with changes

• “foul (or dirty) copy”

thoroughly unpleasant

• “filthy (or foul or nasty or vile) weather we”

characterized by obscenity

• “had a filthy mouth”
• “foul language”
• “smutty jokes”

disgustingly dirty; filled or smeared with offensive matter

• “as filthy as a pigsty”
• “a foul pond”
• “a nasty pigsty of a room”

especially of a ship''s lines etc

• “with its sails afoul”
• “a foul anchor”

hit a foul ball

make impure

• “The industrial wastes polluted the lake”

become or cause to become obstructed

• “The leaves clog our drains in the Fall”
• “The water pipe is backed up”

commit a foul; break the rules

spot, stain, or pollute

• “The townspeople defiled the river by emptying raw sewage into it”

make unclean

• “foul the water”

become soiled and dirty

an act that violates of the rules of a sport