Certain and Foundationless

Opposite meaning words

Certain adjective - Known but not named.

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Foundationless is an antonym for certain.

Nearby Words: certainty, certainly

Foundationless adjective - Having no basis in reason or fact.

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

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Certain is an antonym for foundationless.

Cite this Source

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

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

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

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