Rational and Thickheaded

Opposite meaning words

Rational adjective - Having the ability to reason.

Usage example: human beings are rational creatures

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Thickheaded is an antonym for rational.

Thickheaded adjective - Not having or showing an ability to absorb ideas readily.

Usage example: don't suppose that he's thickheaded just because he doesn't understand English very well

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Rational is an antonym for thickheaded.

Cite this Source

Thickheaded and Rational. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/rational/thickheaded

Rational & Thickheaded. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/rational/thickheaded>.

Thickheaded or Rational. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/rational/thickheaded.

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