"giddier" in the adjective sense
1. dizzy, giddy, 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"
2. airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly
lacking seriousness given to frivolity
"a dizzy blonde"
"light-headed teenagers"
"silly giggles"
Source: WordNet® (An amazing lexical database of English)
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