Rational

//ˈɹæʃ(ə)nəl//

Antonyms for "rational" (18 found)

Adjective(18 words)

absurd arational arbitrary barmy dense dull dull-witted half-brained irrational lumpish mawkish non-rational nonsensical purblind slow on the uptake slow-witted thick three stops short of dagenham

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.