Unfounded and Valid

Opposite meaning words

Unfounded adjective - Having no basis in reason or fact.

Usage example: the accusation proved to be unfounded

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Valid is an antonym for unfounded.

Nearby Word: unfoundedly

Valid adjective - Based on sound reasoning or information.

Usage example: only further investigation will show whether your theory is valid

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Unfounded is an antonym for valid.

Nearby Words: validity, validation

Cite this Source

Valid and Unfounded. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/unfounded/valid

Unfounded & Valid. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/unfounded/valid>.

Valid or Unfounded. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/unfounded/valid.

Google Ngram Viewer shows how "unfounded" and "valid" have occurred on timeline