Etymology
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light-headed (adj.)

also lightheaded, 1530s, "dizzy," from light (adj.1) + -headed. Of persons or actions, "frivolous, vain, thoughtless," from 1570s. Related: Light-headedness.

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Definitions of light-headed

light-headed (adj.)
weak and likely to lose consciousness;
light-headed from lack of sleep
light-headed with wine
Synonyms: faint / light / swooning / lightheaded
light-headed (adj.)
lacking seriousness; given to frivolity;
light-headed teenagers
Synonyms: airheaded / dizzy / empty-headed / featherbrained / giddy / lightheaded / silly
From wordnet.princeton.edu