Fallacious
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
Irrational is a synonym for fallacious in false topic. In some cases you can use "Irrational" instead an adjective "Fallacious", when it comes to topics like illogical.
Irrational
Irrational adjective - Not using or following good reasoning.
Usage example: it's irrational to think that you can continue to consume an excess of calories and not gain weight
Fallacious is a synonym for irrational in illogical topic. You can use "Fallacious" instead an adjective "Irrational".
Nearby Words: irrationality, irrationally
Mutual synonyms
Related pairs
- stupid and fallacious
- stupid and irrational
- wrong and fallacious
- wrong and irrational
- inconsistent and fallacious
- inconsistent and irrational
- invalid and fallacious
- invalid and irrational
- illogical and fallacious
- illogical and irrational
- unsound and fallacious
- unsound and irrational
- senseless and fallacious
- senseless and irrational
Cite this Source
Irrational and Fallacious. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/fallacious/irrational
Fallacious & Irrational. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/fallacious/irrational>.
Irrational or Fallacious. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/fallacious/irrational.
Google Ngram Viewer shows how "fallacious" and "irrational" have occurred on timeline