giddy

adjectives

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"
dizzy, giddy, vertiginous, woozy
is derived from
giddiness
lacking seriousness; given to frivolity
"a dizzy blonde"; "light-headed teenagers"; "silly giggles"
airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly
is derived from
giddiness