Etymology
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brainy (adj.)

1832, "resembling brain matter;" 1845, "intelligent, clever," from brain (n.) + -y (2). Latin equivalent cerebrosus meant "passionate, enraged, hot-headed," leading Tucker to remark that " 'Brainy' is not a natural expression for 'frantic.' "

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Definitions of brainy

brainy (adj.)
having or marked by unusual and impressive intelligence;
our project needs brainy women
Synonyms: brilliant / smart as a whip
From wordnet.princeton.edu