a dirty fighter.
a disgusting smell.
a foul anchor.
a foul odor.
a foul pond.
a loathsome disease.
a nasty pigsty of a room.
a nasty unsporting serve.
a wicked stench.
as filthy as a pigsty.
distasteful language.
fined for unsportsmanlike behavior.
foul (or dirty) copy.
foul language.
foul the water.
had a filthy mouth.
revolting food.
smutty jokes.
the idea of eating meat is repellent to me.
The industrial wastes polluted the lake.
the kitchen smelled really funky.
The leaves clog our drains in the Fall.
The townspeople defiled the river by emptying raw sewage into it.
The water pipe is backed up.
used foul means to gain power.
with its sails afoul.