Rational and Simpleminded

Opposite meaning words

Rational adjective - According to the rules of logic.

Usage example: insisted there was a rational explanation for the strange creaking noises and that there were no such things as ghosts

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Simpleminded is an antonym for rational.

Simpleminded adjective - Showing or marked by a lack of good sense or judgment.

Usage example: scornful of their simpleminded belief that their parents would always be there to take care of them

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Rational is an antonym for simpleminded.

Cite this Source

Simpleminded and Rational. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/rational/simpleminded

Rational & Simpleminded. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/rational/simpleminded>.

Simpleminded or Rational. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/rational/simpleminded.

Google Ngram Viewer shows how "rational" and "simpleminded" have occurred on timeline