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• n  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

• That Brown is still around to pick up this support confounds the experts who pronounced his candidacy dead on arrival due to terminal flightiness.
• And that brings up another reason why the flightiness of contemporary feminism is a problem.
• For those reasons, some see flightiness reigning in stock markets for the foreseeable future.

• arbitrariness
• whimsicality
• whimsy
• whimsey
• capriciousness

Quotes

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• Daniel in New York Times
  It is too early to know whether Ms. Royal's debut in the Middle East signifies "her audacity or her flightiness," a foreign affairs expert, Daniel Vernet, wrote in Le Monde.