birdbrain/ˈbɜː(ɹ)d.bɹeɪn/EtymologyFrom bird + brain, implying that birds, having small brains, are unintelligent (although this is untrue for many birds).birdbrain means someone who is not intelligent. Lexicurio rates it Rare gem — a strength score of 84 out of 100.nounSomeone who is not intelligent.“That birdbrain just drove right through three rows of traffic cones and into the bushes.”