Adjective
1. disgustingly dirty; filled or smeared with offensive matter;
"as filthy as a pigsty""a foul pond""a nasty pigsty of a room"2. vile; despicable;
"a dirty (or lousy) trick""a filthy traitor"3. thoroughly unpleasant;
"filthy (or foul or nasty or vile) weather we're having"4. characterized by obscenity;
"had a filthy mouth""foul language""smutty jokes"