Preposterousness and Rationalness

Opposite meaning words

Preposterousness noun - Lack of good sense or judgment.

Usage example: laughed at the sheer preposterousness of the idea

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Rationalness is an antonym for preposterousness.

Rationalness noun - The quality of being consistent with or based on logic.

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Preposterousness is an antonym for rationalness.

Cite this Source

Rationalness and Preposterousness. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/preposterousness/rationalness

Preposterousness & Rationalness. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/preposterousness/rationalness>.

Rationalness or Preposterousness. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/preposterousness/rationalness.

Google Ngram Viewer shows how "preposterousness" and "rationalness" have occurred on timeline