as in stupid
showing or marked by a lack of good sense or judgment
had the crackbrained idea that he was receiving radio signals from outer space
Synonyms & Similar Words
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Antonyms & Near Antonyms
Example Sentences
Recent Examples of Synonyms for crackbrained
Adjective
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But even the most perfect Constitution can be undone by the wicked with the help of the bought, the stupid, and the cowardly.
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White can believe Hokit said something stupid and still believe fighters should be allowed to speak for themselves.
Adjective
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When it’s done well, the audience doesn’t realize that’s what’s happening; this story is super-silly and the characters actually just got a little bit closer.
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The whole thing was undeniably silly.
Adjective
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It’s presented without winks or nudges, neither as a joke nor necessarily foolish.
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If the target was foolish enough to reuse passwords, credential thefts like these could enable the compromise of more important accounts.
Adjective
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Initially skeptical, Tom becomes increasingly paranoid after a sailor who got lost in the fog essentially goes mad, with his eyes turning white just before dying.
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Relative bargain Please do not be mad at me for relaying this insurance math.
Adjective
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That’s an insane thing to believe.
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And ultimately, the premise of the show is insane horror tropes are happening to boring, normal people.
Adjective
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Swipe fees and minimums make a tenth-of-a-cent charge absurd.
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Yes, Scheffler enters this week as the betting favorite, but by his absurd standards, his probability has actually dipped.
Adjective
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The Hawks have also been rumored as the third team in would-be trades involving Bucks star Giannis Antetokounmpo and Celtics Jaylen Brown … but probably best not to expect anything crazy.
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These are two contradictory sentences that she is made to feel crazy for acknowledging.
Adjective
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Along for the ride is his fawning, idiotic buddy Stevie (Steve Little).
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That’s been an idiotic trope for too long — that participating in the business side of it taints you.
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Cite this Entry
“Crackbrained.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/crackbrained. Accessed 25 Jun. 2026.
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