Main entry: puckishness, mischievousness, impishness, whimsicality
Definition: the trait of behaving like an imp
Main entry: whimsey, whimsicality, whimsy, arbitrariness, capriciousness, flightiness
Definition: the trait of acting unpredictably and more from whim or caprice than from reason or judgment
Usage: I despair at the flightiness and whimsicality of my memory