light-headed

Adjective
  1. Weak and likely to lose consciousness (synset 302555295)
    "suddenly felt faint from the pain"; "was sick and faint from hunger"; "felt light in the head"; "a swooning fit"; "light-headed with wine"; "light-headed from lack of sleep"
  2. Lacking seriousness;
    Given to frivolity (synset 302128108)
    "a dizzy blonde"; "light-headed teenagers"; "silly giggles"

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