1
as in insanity
lack of good sense or judgment
had the inexplicable brainlessness to sell his car for half of what it was worth
Synonyms & Similar Words
Relevance
Antonyms & Near Antonyms
2
as in stupidness
the quality or state of lacking intelligence or quickness of mind
the turkey is one bird that has often been cited for its brainlessness
Synonyms & Similar Words
Antonyms & Near Antonyms
Example Sentences
Recent Examples of Synonyms for brainlessness
Noun
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Piggott was found not guilty by reason of insanity in a trial held a year later.
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Florida Attorney General James Uthmeier is calling for the impeachment of the Miami-Dade judge who acquitted a woman by reason of insanity in the 2021 death of her 15-month-old daughter, arguing the ruling threatens public safety.
Noun
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In an email to Krebs, Valadon claimed that the repo’s commit logs show that GitHub’s default protections against committing secrets—protections designed to protect unwitting or unskilled developers against exactly this kind of stupidness—had been disabled by the repo’s administrator.
Noun
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In the midst of the final stretch of World Cup madness, here are eight shows happening in Kansas City in July.
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Either Cody or Gunther wins because Sami gets screwed; Zayn will then further descend into madness and attack someone after the bell.
Noun
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Cook for 30–40 minutes, depending on thickness, until the salmon flakes easily with a fork, the internal temperature reaches approximately 140°F and the edges are lightly caramelized and smoky.
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Mashing a quarter of the potatoes adds creaminess and thickness to the salad without lots of mayo.
Noun
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Write with simplicity and heart.
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That distinction is important because the company sees simplicity as one of its greatest strengths.
Noun
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Which again, highlights the stupidity of allowing these exceptions in the first place.
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Final negotiations on ‘Peace’ are proceeding, subject to ignorance or stupidity getting in its way.
Noun
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Swift will either ignore the noise as usual, or smile at the absurdity as a secure, proud childless cat lady.
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Fireworks, flags and BBQs are Fourth of July staples, but America’s 250th birthday brings an extra helping of absurdity to Coney Island.
Noun
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There’s the White House and its malicious megaphone of mindlessness; the generative AI advocates and their pushy, pathetic ploys; the Major League Baseball owners and their dedication to self-destruction.
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The show’s real villain is mindlessness, in other words.
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Cite this Entry
“Brainlessness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/brainlessness. Accessed 5 Jul. 2026.
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