1. [adjective] Dizzy, feeling dizzy or unsteady and as if about to fall down.
2. [adjective] Causing dizziness: causing dizziness or a feeling of unsteadiness.
3. [adjective] Lightheartedly silly, or joyfully elated.
4. [adjective] (archaic) Frivolous, impulsive, inconsistent, changeable.
5. [verb] (obsolete) (transitive) To make dizzy or unsteady.
6. [verb] To reel; to whirl.
7. [adjective] 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'.
8. [adjective] Lacking seriousness; given to frivolity; 'a dizzy blonde'; 'light-headed teenagers'; 'silly giggles'.