1
as in dumb
not having or showing an ability to absorb ideas readily
a teacher who affirms that there are no brainless students, only lazy ones
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2
as in stupid
showing or marked by a lack of good sense or judgment
a brainless decision to talk on her cell phone while weaving in and out of traffic
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Recent Examples of brainless
The O’Haras happen to move in next door to him.
Frothy and often filthy without being brainless (send thanks across the Atlantic for that good British dialogue), this is escapism done right.
—
Judy Berman, TIME, 30 Oct. 2024
So, what can the neuronal activity of a tiny, brainless creature possibly tell us about the evolution of our own complex brains?
—Elizabeth Rayne, Ars Technica, 15 June 2024
But the most impressive is first-time writer-director Molly Manning Walker getting us not just to forgive her central triad their brash and brainless bravado but to grieve for it when it’s gone.
—Jessica Kiang, Los Angeles Times, 2 Feb. 2024
An oyster, immobile and nearly brainless, is hardly even an animal, despite what the taxonomists tell us.
—Peter Rubin, Longreads, 9 Jan. 2024
See All Example Sentences for brainless
Recent Examples of Synonyms for brainless
Adjective
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As Legally Blonde's Elle Woods, Witherspoon charted a memorable path from dumb blonde to Harvard Law School graduate.—
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Celebrities fight it out to be eliminated from the competition as quickly as possible to avoid being crowned the nation’s dumbest.—
Adjective
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In tribute to Michael Keane’s hair-pulling on Wednesday, Cerys Jones picked through the stupidest dismissals in Premier League history.—
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To do a lot less foolish, thoughtless, stupid, idiotic things.—
Adjective
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Hoover finished 319 yards on 34-of-50 passing, but his two turnovers were critical mistakes that led to TCU’s slow start in the first half.—
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When visiting the exhibit, plan on taking your time to make the most of it, or what the American Federation of Arts calls slow looking.—
Adjective
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To do a lot less foolish, thoughtless, stupid, idiotic things.—
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No one should be defending activists who engage in the most foolish and dangerous actions!—
Adjective
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This simple taupe geometric style peel-and-stick wallpaper is affordable, easy to apply, and looks gorgeous without being too bold or loud.—
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The simple addition of zipper detailing adds a preppy energy to the top.—
Adjective
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To say the road to the Super Bowl goes through Jacksonville sounds silly in the NFL’s grand scheme, but for a talented and decorated Bills group that never has won there, that’s the first stop on the quest.—
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Citing the Monroe Doctrine is silly.—
Adjective
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They’re made of a buttery soft, thick material that will keep you warm and cozy at home all winter.—
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Too thick of a mascara coat, and suddenly my gaze droops.—
Adjective
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Or why roads and other critical infrastructure projects now take untold years and insane amounts of money to complete, and by the time they are finally opened are already rendered all but obsolete?—
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In this abjectly insane political environment that Minnesotans have created for themselves, the federal agent has about as much chance of a fair trial as the Vikings have of winning this year’s Super Bowl, which is to say, none.—
Cite this Entry
“Brainless.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/brainless. Accessed 12 Jan. 2026.
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