Dictionary.com
Thesaurus.com
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

Derived Forms

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.

For an intelligent man, it was a howlingly brainless offence.

From BBC • Mar. 7, 2026

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

From The Wall Street Journal • Dec. 17, 2025

In the aftermath, England was slammed as "brainless" and even "arrogant" by former greats for their meek performance after putting themselves in a strong position to win.

From Barron's • Nov. 29, 2025

The dialogue was more dignified: no brainless chatter or mawkish introductions.

From New York Times • Jun. 17, 2024

I should be avoiding him entirely after my brainless and embarrassing babbling yesterday.

From "Twilight" by Stephenie Meyer

Vocabulary.com logo
by dictionary.com

Look it up. Learn it forever.

Remember "brainless" for good with VocabTrainer. Expand your vocabulary effortlessly with personalized learning tools that adapt to your goals.

Take me to Vocabulary.com