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Synonyms

brainless

American  
[breyn-lis] / ˈbreɪn lɪs /

adjective

  1. mentally weak; foolish; witless; stupid.

brainless British  
/ ˈbreɪnlɪs /

adjective

  1. stupid or foolish

"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

  • brainlessly adverb
  • brainlessness noun

Etymology

Origin of brainless

First recorded in 1400–50, brainless is from the late Middle English word braynles. See brain, -less

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.

Former England fast bowler Steven Finn, commentating on TNT, said it was "completely brainless".

From BBC • Jan. 4, 2026

Why do we love this story so much, enough to subject ourselves to even the weirdest, most brainless versions of it that can be spun from the public domain?

From Salon • Dec. 24, 2025

So it goes throughout this visually mammoth but brainless audio-visual excursion.

From The Wall Street Journal • Dec. 17, 2025

A stunned England woke Sunday to savage criticism after their meek capitulation in the first Ashes Test, branded "brainless" and "damaged" by former greats after their cavalier approach backfired.

From Barron's • Nov. 23, 2025

He’s grinning crazily, kind of like he’s brainless.

From "I'll Give You the Sun" by Jandy Nelson

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.