Not faithful; not observant of promises, vows, allegiance, or duty; violating trust or confidence; treacherous; perfidious; as, an unfaithful subject; an unfaithful agent or servant. My feet, through wine, unfaithful to their weight. Pope. His honor rooted in dishonor stood, And faith unfaithful kept him falsely true. Tennyson.
Not possessing faith; infidel. [R.] Milton. -- Un*faith"ful*ly, adv. -- Un*faith"ful*ness, n.
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