01 a. Not faithful; not observant of promises, vows, allegiance, or duty; violating trust or confidence; treacherous; perfidious; as, an unfaithf…
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1.
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.
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2.
Not possessing faith; infidel.[R.]