Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Not true to duty or obligation; disloyal or unfaithful.
  • adjective Breaking trust in a marriage or relationship by having sexual relations with someone other than one's spouse or sexual partner.
  • adjective Having no religious faith.

from The Century Dictionary.

  • Without faith or belief; not giving credit; unbelieving; especially, without religious faith or faith in the Christian religion; skeptical.
  • Without faithfulness or fidelity; not keeping faith; not adhering to allegiance, vows, or duty; disloyal: as, a faithless subject; a faithless servant; a faithless husband or wife.
  • Tending to disappoint or deceive; deceptive; delusive.
  • Synonyms and False, untruthful, perfidious, treacherous.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Not believing; not giving credit.
  • adjective Not believing on God or religion; specifically, not believing in the Christian religion.
  • adjective Not observant of promises or covenants.
  • adjective Not true to allegiance, duty, or vows; perfidious; trecherous; disloyal; not of true fidelity; inconstant, as a husband or a wife.
  • adjective Serving to disappoint or deceive; delusive; unsatisfying.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Lacking faith; lacking belief in something.
  • adjective Not believing in God, religion, or a comparable ideology.
  • adjective Unfaithful; not of true fidelity; inconstant, as a husband or a wife.
  • adjective Not observant of promises or covenants.
  • adjective Not true to allegiance, duty, or vows; perfidious; treacherous; disloyal.
  • adjective Serving to disappoint or deceive; delusive; unsatisfying.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective having the character of, or characteristic of, a traitor

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

faith +‎ -less

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