D defs.my
Entry 2 senses Webster, 1913

Untruth

/ŭn-trōōth′/ · Un·truth · IPA /ʌnˈtɹuːθ/
01 n. The quality of being untrue; contrariety to truth; want of veracity; also, treachery; faithlessness; disloyalty.
  1. 1.
    The quality of being untrue; contrariety to truth; want of veracity; also, treachery; faithlessness; disloyalty.
  2. 2.
    That which is untrue; a false assertion; a falsehood; a lie; also, an act of treachery or disloyalty.
Syn. Lie; falsehood. See Lie.