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Adjective: flighty (flightier,flightiest)  flI-tee
  1. Guided by whim and fancy
    "flighty young girls";
    - flyaway, head-in-the-clouds, scatterbrained, dippy [informal]
  2. Unpredictably excitable (especially of horses)
    - skittish, spooky [N. Amer, informal], nervous, skittery

Derived forms: flightiest, flightier

See also: ditsy [N. Amer, informal], ditzy [N. Amer, informal], excitable, frivolous