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Noun: flightiness  flI-tee-nus
  1. 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";
    - arbitrariness, whimsicality, whimsy, whimsey, capriciousness

Type of: irresponsibility, irresponsibleness