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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.

The unfaithfulness of a married person to the marriage bed; sexual intercourse by a married man with another than his wife, or voluntary sexual intercourse by a married woman with another than her husband.

One who swerves from and is unfaithful to the marriage vow. [Poetic] Shak.

A man whose wife is unfaithful; the husband of an adulteress. Shak.

A woman whose husband is unfaithful to her. [Obs.]

Lost; adrift; hence, wanting; careless; neglectful; unfaithful. They easily prevailed, so as to seize upon the vacant, unoccupied, and derelict minds of his [Chatham's] friends; and instantly they turned the vessel wholly out of the course of his policy. Burke. A government which is either unable or unwilling to redres…

Treachery; deceit; perfidy; unfaithfulness. Betrayed by falsehood of his guard. Shak.

e; contrariety to the fact; inaccuracy; want of integrity or uprightness; double dealing; unfaithfulness; treachery; perfidy; as, the falseness of a report, a drawing, or a singer's notes; the falseness of a man, or of his word.

Unfaithfulness to the marriage vow or contract; violation of the marriage covenant by adultery.

To serve unfaithfully.

Apostate; false; unfaithful. Who, for so many benefits received, Turned recreant to God, ingrate and false. Milton.

To avoid; to escape; to neglect; -- implying unfaithfulness or fraud; as, to shirk duty. The usual makeshift by which they try to shirk difficulties. Hare.

part asunder suddenly; as, a mast snaps; a needle snaps. But this weapon will snap short, unfaithful to the hand that employs it. Burke.

That may not be trusted; not worthy of trust; unfaithful. -- Trust"less*ness, n.