underbrained

== English == === Etymology === From under- +‎ brained. === Pronunciation === === Adjective === underbrained (comparative more underbrained, superlative most underbrained) 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. Synonyms: see Thesaurus:stupid