Etymology
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giddy (adj.)

Old English gidig, variant of gydig "insane, mad, stupid," perhaps literally "possessed (by a spirit)," if it is from Proto-Germanic *gud-iga- "possessed by a god," from *gudam "god" (see god (n.)) + *-ig "possessed." Meaning "having a confused, swimming sensation" is from 1560s (compare sense evolution of dizzy). Meaning "elated" is from 1540s. Related: Giddily; giddiness.

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Definitions of giddy

giddy (adj.)
having or causing a whirling sensation; liable to falling;
a giddy precipice
had a headache and felt giddy
Synonyms: dizzy / woozy / vertiginous
giddy (adj.)
lacking seriousness; given to frivolity;
Synonyms: airheaded / dizzy / empty-headed / featherbrained / light-headed / lightheaded / silly
From wordnet.princeton.edu