Untruth

Part of speech: noun (n.)

1. The quality of being untrue; contrariety to truth; want of veracity; also, treachery; faithlessness; disloyalty. Chaucer.

2. That which is untrue; a false assertion; a falsehood; a lie; also, an act of treachery or disloyalty. Shak.

Synonyms: Lie; falsehood. See Lie.