adjective, brainier, brainiest. Informal.
intelligent; clever; intellectual.

1835–45; brain + -y1

brainily, adverb
braininess, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
brainy (ˈbreɪnɪ)
adj , brainier, brainiest
informal clever; intelligent

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1845, from brain + -y (2).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Thus, the only way the cortex of humans and other brainy species can fit into
  the skull is by folding.
Have to give all those brainy people something to do.
Dazzled as much by her brainy astronomical riffs as by her blond bombshell good
  looks, he persuades her to marry him.
What would happen when the brainy guys keep on joining financial world.
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