definition of
giddy

[1] #1 giddy s. [dizzy, woozy, vertiginous] having or causing a whirling sensation; liable to falling; "had a dizzy spell"; "a dizzy pinnacle"; "had a headache and felt giddy"; "a giddy precipice"; "feeling woozy from the blow on his head"; "a vertiginous climb up the face of the cliff". wn

[2] #2 giddy s. [airheaded, dizzy, empty-headed, featherbrained, light-headed, lightheaded, silly] lacking seriousness; given to frivolity; "a dizzy blonde"; "light-headed teenagers"; "silly giggles". wn