foul

highly offensive; arousing aversion or disgust

“a disgusting smell”

“distasteful language”

“a loathsome disease”

“the idea of eating meat is repellent to me”

offensively malodorous

“a foul odor”

“the kitchen smelled really funky”

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”

characterized by obscenity

“had a filthy mouth”

“foul language”

“smutty jokes”

an act that violates the rules of a sport

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”