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English definition of “birdbrain”

birdbrain

noun [C usually singular] uk   /ˈbɜːd.breɪn/ us    /ˈbɝːd-/ mainly US informal
a stupid personStupid and silly people
birdbrained
adjective uk   /-breɪnd/ mainly US informal us  
stupidStupid and sillyOf unsound mind
(Definition of birdbrain from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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