Definition of brainy adjective from the Oxford Advanced Learner's Dictionary

 

brainy

 adjective
adjective
BrE BrE//ˈbreɪni//
 
; NAmE NAmE//ˈbreɪni//
 
(informal)(brainier, brainiest) Clever
 
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very intelligent He’s a brainy kid. See related entries: Clever
See the Oxford Advanced American Dictionary entry: brainy