filthy in WordNet English dictionary

1. characterized by obscenity
   "had a filthy mouth"; "foul language"; "smutty jokes"
   cruddy  filthy  foul  nasty  smutty 
   
2. vile; despicable
   "a dirty (or lousy) trick"; "a filthy traitor"
   dirty  filthy  lousy 
   
3. disgustingly dirty; filled or smeared with offensive matter
   "as filthy as a pigsty"; "a foul pond"; "a nasty pigsty of a room"
   filthy  foul  nasty