capriciousness

Noun

• 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
    

• the quality of being guided by sudden unpredictable impulses

Related words

• Synonyms: 
  flightiness , arbitrariness , whimsicality , whimsy , whimsey , unpredictability