'empty-headed' definitions:

Definition of 'empty-headed'

(from WordNet)
adjective
Lacking seriousness; given to frivolity; "a dizzy blonde"; "light-headed teenagers"; "silly giggles" [syn: airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly]

Definition of 'empty-headed'

From: GCIDE
  • empty-headed \empty-headed\ adj. lacking seriousness; given to frivolity.
  • Syn: airheaded, dizzy, featherbrained, giddy, lightheaded, light-headed, silly. [WordNet 1.5]