Fallacious and Sure

Opposite meaning words

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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Sure is an antonym for fallacious.

Sure adjective - Having or showing a mind free from doubt.

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Fallacious is an antonym for sure.

Nearby Word: surely

Cite this Source

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

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

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

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