- flightiness, arbitrariness, whimsicality, whimsy, whimsey, capriciousness - the trait of acting unpredictably and more from whim or caprice than from reason or judgment; "I despair at the flightiness and whimsicality of my memory"
--1 is a kind of irresponsibility, irresponsibleness
- impishness, mischievousness, puckishness, whimsicality - the trait of behaving like an imp
--2 is a kind of playfulness, fun