underbrained

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adjective

Lacking intelligence.

“Newton Mackintosh, Lucy Lake Poor Lucy Lake was overgrown, / But somewhat underbrained. / She did not know enough, I own, / To go in when it rained.”

Similar
addlebrainedaddlepatedairheadedbee-brainedbeef-wittedsoftbeefheadedbeetle-headed
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Meanings

adjectiveunderbrained (comparative more underbrained, superlative most underbrained)

comparative more underbrained · superlative most underbrained

  1. Lacking intelligence.

    Newton Mackintosh, Lucy Lake Poor Lucy Lake was overgrown, / But somewhat underbrained. / She did not know enough, I own, / To go in when it rained.

    1 more example

    I hope that even a species as underbrained as yours can understand that survival is a very good idea.

    2000, W. R. Thompson, Infiltrator

    Synonyms: addlebrained, addlepated, airheaded, bee-brained, beef-witted, soft, beefheaded, beetle-headed

Synonyms & antonyms

adjectiveLacking intelligence.

Similar
addlebrainedaddlepatedairheadedbee-brainedbeef-wittedsoftbeefheadedbeetle-headedbirdbrainedblockheadedBoeotianboneheadedboofheadedbraindeadbrainlessbubbleheadedbuffle-headedbullet-headedcerebrally challengedchildish

Origin

From under- + brained.

Full word history & related roots →
Cite this entry
APA

underbrained. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/underbrained

MLA

“underbrained.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/underbrained. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “underbrained,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/underbrained.

Source: underbrained on Wiktionary, CC BY-SA 4.0.