Deficient and Fallacious

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Deficient adjective - Lacking some necessary part.

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Fallacious and deficient are semantically related. In some cases you can use "Fallacious" instead an adjective "Deficient".

Nearby Words: deficiency, deficit, deficiently

Fallacious adjective - Not using or following good reasoning.

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Deficient and fallacious are semantically related. Sometimes you can use "Deficient" instead an adjective "Fallacious".

Cite this Source

Fallacious and Deficient. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/deficient/fallacious

Deficient & Fallacious. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/deficient/fallacious>.

Fallacious or Deficient. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/deficient/fallacious.

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