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Noun: flightiness
  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

Derived forms: flightinesses

See also: flighty

Type of: irresponsibility, irresponsibleness