giddy

Adjective

• lacking seriousness; given to frivolity
  • a dizzy blonde
    
  • light-headed teenagers
    
  • silly giggles
    

• 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
    

Related words

• Synonyms: 
  airheaded , dizzy , empty-headed , featherbrained , light-headed , lightheaded , silly , woozy , vertiginous