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From Middle English feithles, equivalent to faith +‎ -less.


faithless (comparative more faithless, superlative most faithless)

  1. Lacking faith; lacking belief in something.
    • 1970, Margaret Wade Campbell Deland, Old Chester Days, page 58:
      "You're so faithless about pills," he said, "that I'm not going to give you any."
  2. Not believing in God, religion, or a comparable ideology.
  3. Unfaithful; not of true fidelity; inconstant, as a husband or a wife.
    • 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

Derived terms[edit]