pleonasm Share definition Flag A pleonasm is a redundant description. It is describing a word using adjectives that apply to it's inherent characteristics. Person 1: Tim is a stupid idiot. Person 2: As opposed to a smart idiot? You just used a pleonasm. pleonasm by PatrickRF February 7, 2008 0 0 Get merch Get the pleonasm mug. Buy Now — $32.95 See more merch