Foundationless and Rational

Opposite meaning words

Foundationless adjective - Having no basis in reason or fact.

Usage example: a careful investigation proved that the charges were foundationless

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Rational is an antonym for foundationless.

Rational adjective - Having the ability to reason.

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Foundationless is an antonym for rational.

Cite this Source

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

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

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

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