Adjective filthy has 4 senses
  1. filthy, foul, nasty - disgustingly dirty; filled or smeared with offensive matter; "as filthy as a pigsty"; "a foul pond"; "a nasty pigsty of a room"
    Antonym: clean (indirect, via dirty)
  2. dirty, filthy, lousy - vile; despicable; "a dirty (or lousy) trick"; "a filthy traitor"
    Antonym: nice (indirect, via nasty)
  3. filthy, foul, nasty, vile - thoroughly unpleasant; "filthy (or foul or nasty or vile) weather we're having"
    Antonym: clement (indirect, via inclement)
  4. filthy, foul, nasty, smutty - characterized by obscenity; "had a filthy mouth"; "foul language"; "smutty jokes"
    Antonyms: clean, unobjectionable (indirect, via dirty)
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