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Faint or dizzy: felt lightheaded from running.
1. giddy, dizzy, or delirious.
2. having or showing a frivolous or volatile disposition; thoughtless.
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|Adj.||1.||lightheaded - weak and likely to lose consciousness; "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.||lightheaded - lacking seriousness; given to frivolity; "a dizzy blonde"; "light-headed teenagers"; "silly giggles"|
frivolous - not serious in content or attitude or behavior; "a frivolous novel"; "a frivolous remark"; "a frivolous young woman"