truthiness /ˈtɹuːθinəs/ noun3 •(US, informal) Superficial or asserted truthfulness, without recourse to evidence.'Cause you're looking at a straight-shooter, America. I tell it like it is. I calls 'em like I sees 'em. I will speak to you in plain simple English. And that brings us to tonight's word: truthiness. — 2005 •The property of being truthy, i.e. evaluating to true in a Boolean context.Usually, when you are receiving a Boolean value, you are most interested in checking its truthiness rather than its type. — 2020 •(no longer used, rare) Truthfulness.