noun, slang ·Moderate ·High school level

Definitions

Noun

1. 1
   Someone who is not intelligent. colloquial

   "That birdbrain just drove right through three rows of traffic cones and into the bushes."

2. 2
   a person with confused ideas; incapable of serious thought wordnet

Synonyms

All synonyms

addle headaddle-headaddleheadairheadassweedblither

Antonyms

All antonyms

brain surgeonrocket scientist

Example

More examples

"That birdbrain just drove right through three rows of traffic cones and into the bushes."

Etymology

From bird + brain, implying that birds, having small brains, are unintelligent (although this is untrue for many birds).

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.