Certain and Nonvalid

Opposite meaning words

Certain adjective - Known but not named.

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Nonvalid is an antonym for certain.

Nearby Words: certainty, certainly

Nonvalid adjective - Having no basis in reason or fact.

Usage example: a nonvalid theory that most scientists rejected long ago

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Certain is an antonym for nonvalid.

Cite this Source

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

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

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

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