smooth brain

noun

A stupid person.

“I could not have made it easier for you smooth brains, yet you still messed up!”

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alcatoteasshatarseholeassholebayardberkbirdbrainblither
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Meanings

nounsmooth brain (plural smooth brains)

plural smooth brains · alternative smoothbrain

  1. derogatoryoffensiveA stupid person.

    I could not have made it easier for you smooth brains, yet you still messed up!

    Synonyms: alcatote, asshat, arsehole, asshole, bayard, berk, birdbrain, blither

  2. derogatoryoffensiveUsed other than figuratively or idiomatically: see smooth, brain.

Synonyms & antonyms

nounA stupid person.

Similar
alcatoteasshatarseholeassholebayardberkbirdbrainblitherbobchinboneheadbozobuffoonbrickheadCharliechuckleheadchowderheadchumpclartclownder-brain
Also see
foolidiot

Origin

Nominalization of smooth-brained, possibly by reference to lissencephaly (a brain abnormality, usually resulting in severe developmental delay, characterized by the surface of the brain being smooth), or simply by reference to the human brain typically being wrinkly.

Full word history & related roots →
Cite this entry
APA

smooth brain. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/smooth%20brain

MLA

“smooth brain.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/smooth%20brain. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “smooth brain,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/smooth%20brain.

Source: smooth brain on Wiktionary, CC BY-SA 4.0.