Etymology From a compound of bird + brain, implying that the brains of birds are small.
Pronunciation audio|en-us-birdbrain.ogg|Audio (US)
Noun birdbrain #Someone who is not very smart or clever. #:That birdbrain just drove right through three rows of traffic cones and into the bushes.
Translations Spanish: t|es|casquivano m, t|es|casquivana m