n. 1. The quality of being untrue; contrariety to truth; want of veracity; also, treachery; faithlessness; disloyalty. Chaucer. [ 1913 Webster ]
2. That which is untrue; a false assertion; a falsehood; a lie; also, an act of treachery or disloyalty. Shak. [ 1913 Webster ]
Syn. -- Lie; falsehood. See Lie. [ 1913 Webster ]
a. Not truthful; unveracious; contrary to the truth or the fact. -- Un*truth"ful*ly, adv. -- Un*truth"ful*ness, n. [ 1913 Webster ]