faithless Meaning, Definition & Usage

  1. adjective satellite having the character of, or characteristic of, a traitor
    treasonous; unfaithful; treasonable; traitorous.
    • the faithless Benedict Arnold
    • a lying traitorous insurrectionist

WordNet

Faith"less adjective
Definitions
  1. Not believing; not giving credit.
    Be not faithless, but believing. John xx. 27.
  2. Not believing on God or religion; specifically, not believing in the Christian religion. Shak.
  3. Not observant of promises or covenants.
  4. Not true to allegiance, duty, or vows; perfidious; trecherous; disloyal; not of true fidelity; inconstant, as a husband or a wife.
    A most unnatural and faithless service. Shak.
  5. Serving to disappoint or deceive; delusive; unsatisfying. "Yonder faithless phantom." Goldsmith. -- Faith"less*ly, adv.Faith"less*ness, n.

Webster 1913