Certain and Fallacious

Opposite meaning words

Certain adjective - Known but not named.

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Fallacious is an antonym for certain.

Nearby Words: certainty, certainly

Fallacious adjective - Not using or following good reasoning.

Usage example: it's fallacious to say that something must exist because science hasn't proven its nonexistence

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Certain is an antonym for fallacious.

Cite this Source

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

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

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

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