Nonrational and Sure

Opposite meaning words

Nonrational adjective - Not using or following good reasoning.

Usage example: was so upset that he was completely nonrational for a moment

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Sure is an antonym for nonrational.

Sure adjective - Having or showing a mind free from doubt.

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Nonrational is an antonym for sure.

Nearby Word: surely

Cite this Source

Sure and Nonrational. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/nonrational/sure

Nonrational & Sure. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/nonrational/sure>.

Sure or Nonrational. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/nonrational/sure.

Google Ngram Viewer shows how "nonrational" and "sure" have occurred on timeline