brainless

adjective

brain·​less ˈbrān-ləs 

1

: devoid of intelligence : stupid

a brainless decision

2

: not demanding understanding or intelligence : dull, stupefying

a brainless task

brainless repetition

3

: lacking a brain

brainless organisms

brainlessly adverb

brainlessness noun

Synonyms of brainless

• dumb
• stupid
• slow
• simple
• thick
• mindless

Examples of brainless in a Sentence

He thought most of his coworkers were brainless.

The plot of the new movie is brainless and the acting is terrible.

Recent Examples on the Web

Youth then cuts to Horgan’s protagonist, Alex, mid–brainless-social-media scroll, watching an AI video of someone giving a cockatiel a haircut. — Kathryn Vanarendonk, Vulture, 18 Sep. 2026

Imagine Marlon James in a crisp, white shirt and conservative tie, droning through another day of brainless ad copy. — Geoff Edgers, Washington Post, 16 Sep. 2026

Thatcher plays disfigured, suicidal young protagonist P Burke who is hired by a mega tech corporation to virtually operate a beautiful but brainless ‘flesh body’ called Delphi, grown in a lab with the sole purpose of influencing the masses and selling products. — Melanie Goodfellow, Deadline, 6 May 2026

Miller has always taken the American people for brainless, heartless chumps lost in a swamp of nostalgia who’ll believe whatever Trumpworld tells them to. — Gustavo Arellano, Los Angeles Times, 29 Jan. 2026

Word History

First Known Use

15th century, in the meaning defined at sense 1

Rhymes for brainless

• painless
• rainless
• stainless

Kids Definition

brainless

adjective

brain·​less ˈbrān-ləs 

: lacking intelligence

brainlessly adverb