'birdbrain' definitions:

Definition of 'birdbrain'

From: WordNet
noun
A person with confused ideas; incapable of serious thought [syn: addle-head, addlehead, loon, birdbrain]

Definition of 'birdbrain'

From: GCIDE
  • birdbrain \bird"brain`\ n.
  • 1. a person with confused ideas; incapable of serious thought.
  • Syn: addle-head, loon. [WordNet 1.5] bird-cage Bird cage