1. Lacking faith; lacking belief in something.
  2. Not believing in God, religion, or a comparable ideology.
  3. Unfaithful (said of people, towards their partners)
    • 1996, Frederick Ahl, Hanna Roisman, The Odyssey re-formed, p. 283:
      Menelaus, who fought to recover his faithless wife, has clearly rooted himself in Sparta for the remainder of his life […]
  4. Not observant of promises or covenants.
  5. Not true to allegiance, duty, or vows
    Synonyms: perfidious, treacherous, disloyal
  6. Serving to disappoint or deceive
    Synonyms: delusive, unsatisfying

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Offline English dictionary