foul

become or cause to become obstructed

characterized by obscenity

“foul language”

an act that violates the rules of a sport

become soiled and dirty

commit a foul; break the rules

hit a foul ball

make unclean

“foul the water”

not hit between the foul lines

defaced with changes

“foul (or dirty) copy”

violating accepted standards or rules

“used foul means to gain power”

make impure

offensively malodorous

“a foul odor”