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Synonyms

brainy

American  
[brey-nee] / ˈbreɪ ni /

adjective

Informal.
  • brainier,
    comparative
  • brainiest
    superlative
  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

Derived Forms

Inflected Forms

Adjectives

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.

See Examples For:

The academic gloves are off — which isn’t to say that it’s not brainy.

From Los Angeles Times Jun. 25, 2026

In a World Cup where the boffins with their big brainy heads and their super computers are working overtime on who might play who in the last 32, there are other calculations worth conjuring with.

From BBC Jun. 21, 2026

While corvids and parrots are unquestionably brainy, they flounder with some cognitive tasks.

From The Wall Street Journal May 22, 2026

The ad, titled “Good Will Dunkin’,” featured Affleck as the original brainy Boston math whiz, who happens to work at Dunkin’ and arranges a display of Munchkins in a Fibonacci sequence.

From The Wall Street Journal Feb. 9, 2026

Somewhere between super popular and well'liked: not brainy, not jocks, not rich, not druggies, not mean, not goody-goody, not huge, not flat.

From "Wonder" by R. J. Palacio

“Midnight Suns” comes from 2K Games’ Firaxis studio, known for brainier challenges like “Civilization” and “XCOM.”

From Seattle Times Nov. 28, 2022

Though they lack nerve cells, sponges have some of the same specialized genes for synapses that brainier creatures possess, studies have shown.

From Science Magazine Nov. 3, 2021

Even you acknowledge this when the live studio audience doesn't laugh at one of your brainier opening punchlines.

From Salon Sep. 30, 2021

"It is gonna be a no brainier," Hong said.

From Reuters Sep. 13, 2021

There is no land on earth which has produced such quaint and curious characters as the great mountainous regions of the South, and yet no country has produced nobler or brainier men.

From Gov. Bob. Taylor's Tales by Robert L. Taylor

One of the brainiest, funniest comedies of the year..

From Salon Jun. 28, 2025

Britain's brainiest kid went on to achieve three maths degrees including one from Cambridge, and is currently studying for his PhD.

From BBC Jan. 28, 2023

A scientist and tech-tinkerer, she’s always the brainiest person in the room, giving Q from the James Bond series a run for his money by inventing the coolest gadgets.

From Slate Feb. 6, 2018

Of those choreographers, Cunningham and Ms. Brown were among the brainiest.

From New York Times Mar. 20, 2017

“My brother’s the brainiest kid I’ve ever met, but that clearly doesn’t translate to street smarts.”

From "The Parker Inheritance" by Varian Johnson

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