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Adjective: lightheaded  ,lIt'he-did
  1. Lacking seriousness; given to frivolity
    "a lightheaded blonde";
    - airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, silly
  2. Weak and likely to lose consciousness
    "suddenly felt lightheaded from the pain";
    - faint, light, swooning, light-headed

See also: frivolous, ill, sick

Encyclopedia: Lightheaded