noun 1.the quality of seeming to be true according to one's intuition, opinion, or perception without regard to logic, factual evidence, or the like: the growing trend of truthiness as opposed to truth.
2.Rare. truthfulness or faithfulness.
Origin: 1824for def 2; 2005 for def 1 (coined by Stephen Colbert (1964– ), U.S. comedian and TV host);
truth +
-y1 +
-ness