The trait of behaving like an imp
English: impishness, mischievousness, puckishness, whimsicality
whimsicalityEnglish
whimsicality, arbitrariness, capriciousness, flightiness, impishness
Noun
The trait of acting unpredictably and more from whim or caprice than from reason or judgment
English: flightiness, arbitrariness, whimsicality, whimsy, whimsey, capriciousness