giddy in WordNet English dictionary

1. lacking seriousness; given to frivolity
   "a dizzy blonde"; "light-headed teenagers"; "silly giggles"
   airheaded  dizzy  empty-headed  featherbrained  giddy  light-headed  lightheaded  silly 
   
2. 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  woozy  vertiginous