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Synonyms

brainy

American  
[brey-nee] / ˈbreɪ ni /

adjective

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


brainy British  
/ ˈbreɪnɪ /

adjective

  1. informal clever; intelligent

"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

Other Word Forms

  • brainily adverb
  • braininess noun

Etymology

Origin of brainy

First recorded in 1835–45; brain + -y 1

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In 1978, the New Yorker called Keaton “one of the most comedically pure and brainy actresses in our midst.”

From The Wall Street Journal • Dec. 23, 2025

Its brainy combination of jazz, classical, post-rock and dreamy synths could easily scare the most conservative faction of Latin Grammy voters — and that would be a grave mistake.

From Los Angeles Times • Jul. 30, 2025

Ms Terry said people keep assuming she is "brainy" because she is studying for her fourth degree.

From BBC • May 28, 2024

His bandmates were equally brainy: Mr. Gottlieb had a doctorate in musicology and Mr. Yarbrough once worked as a bouncer to pay for Greek lessons.

From New York Times • May 12, 2024

But I had a striking sense that if I’d had a son, he would, at the core, be a lot like this brainy, combative oddball sitting in a musty apartment in a small Idaho town.

From "Geeks: How Two Lost Boys Rode the Internet Out of Idaho" by Jon Katz