Having in the head a sensation of whirling or reeling about; having lost the power of preserving the balance of the body, and therefore wavering and inclined to fall; lightheaded; dizzy.
source: Webster 1913
adjective satellite
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.
source: WordNet 3.0
lacking seriousness; given to frivolity
A dizzy blonde. Light-headed teenagers. Silly giggles.