untruth

noun, plural un·truths [uhn-trooth z, –trooths] /ʌnˈtruðz, -ˈtruθs/.

1. the state or character of being untrue.
2. want of veracity; divergence from truth.
3. something untrue; a falsehood or lie.
4. Archaic. unfaithfulness; disloyalty.

noun

1. the state or quality of being untrue
2. a statement, fact, etc, that is not true

n.Old English untreowþ “unfaithfulness,” from un- (1) “not” + truth. Cf. Old Norse utrygð. Meaning “falsehood” is attested from mid-15c., as is that of “a lie.”