capriciousness [kə'priʃəsnis]

1. the quality of being guided by sudden unpredictable impulses
   [同] capriciousness, unpredictability
   
2. the trait of acting unpredictably and more from whim or caprice than from reason or judgment
   [同] flightiness, arbitrariness, capriciousness, whimsey, whimsicality, whimsy
   [例]
   
   • I despair at the flightiness and whimsicality of my memory