birdbrain

[ burd-breyn ]
/ ˈbɜrdˌbreɪn /

noun Slang.

a stupid, foolish, or scatterbrained person.

Origin of birdbrain

First recorded in 1920–25; bird + brain
Related formsbird·brained, bird-brained, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for bird-brained

bird-brained

adjective

informal silly; stupid

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012