a foul pond.
a good man to have on your side in a tight situation.
a nasty accident.
a nasty pigsty of a room.
a nasty problem.
a nasty shock.
a nasty smell.
a nasty trick to pull.
as filthy as a pigsty.
foul language.
had a filthy mouth.
in a nasty mood.
smutty jokes.
Will he say nasty things at my funeral?.