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[brey-nee] /ˈbreɪ ni/
adjective, brainier, brainiest. Informal.
intelligent; clever; intellectual.
1835-45; brain + -y1
Related forms
brainily, adverb
braininess, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for brainy
  • 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.
  • He is brainy, he is confident, he is parsimonious with social interaction.
  • Among the invertebrates the octopus, squid and cuttlefish are rather brainy.
  • It was a common sport among us brainy younguns to spot mistakes in them.
  • He would sit out lucky streaks by opponents by relying on the belief that over time his brainy, measured tactics would prevail.
  • brainy but easily distracted, the author barely made it through high school and dropped out of college.
  • The patterers were the brainy, sophisticated ones-the self-proclaimed aristocracy of the street.
British Dictionary definitions for brainy


adjective brainier, brainiest
(informal) clever; intelligent
Derived Forms
brainily, adverb
braininess, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for brainy
1845, from brain + -y (2).
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for brainy



Intelligent; sagacious (1840s+)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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