Foundationless and Reasonable

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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Reasonable is an antonym for foundationless in topics: justification, unwarranted, not reasonable or right, not based on fact, without substantiation.

Reasonable adjective - According to the rules of logic.

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Foundationless is an antonym for reasonable.

Cite this Source

Reasonable and Foundationless. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/foundationless/reasonable

Foundationless & Reasonable. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/foundationless/reasonable>.

Reasonable or Foundationless. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/foundationless/reasonable.

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