flightiness
1. [ noun ] the trait of acting unpredictably and more from whim or caprice than from reason or judgment
Synonyms: whimsicality whimsy whimsey capriciousness arbitrariness
Examples:

"I despair at the flightiness and whimsicality of my memory"

Related terms: irresponsibility
Similar spelling:   flightless
  flight_line
  flagstone
  flyweight
  flight_path
  flighted
  flight_strip
  fluoxetine