inveracity

1. Lack of veracity; untruthfulness.
2. An untruth; a falsehood.

noun

1. The practice of lying: falsehood, mendacity, perjury, truthlessness, untruthfulness. See true/false.
2. An untrue declaration: canard, cock-and-bull story, falsehood, falsity, fib, fiction, lie², misrepresentation, misstatement, prevarication, story, tale, untruth. Informal fish story, tall tale. Slang whopper. See true/false.