featherbrained

Adjective
  1. Lacking seriousness;
    Given to frivolity (synset 302128108)
    "a dizzy blonde"; "light-headed teenagers"; "silly giggles"
    similar to: frivolous - not serious in content or attitude or behavior
    same as: airheaded, dizzy, empty-headed, giddy, light-headed, lightheaded, silly

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