Fallacious and Substantiated

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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Substantiated is an antonym for fallacious.

Definitions of Fallacious not found.

Fallacious is an antonym for substantiated.

Cite this Source

Substantiated and Fallacious. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/fallacious/substantiated

Fallacious & Substantiated. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/fallacious/substantiated>.

Substantiated or Fallacious. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/fallacious/substantiated.

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