Fallacious
Fallacious adjective - Not using or following good reasoning.
Fatuous and fallacious are semantically related. In some cases you can use "Fatuous" instead an adjective "Fallacious".
Fatuous
Fatuous adjective - Not having or showing an ability to absorb ideas readily.
Usage example: the fatuous questions that the audience members asked after the lecture suggested to the oceanographer that they had understood little
Fallacious and fatuous are semantically related. Sometimes you can use "Fallacious" instead an adjective "Fatuous".
Mutual synonyms
Cite this Source
Fatuous and Fallacious. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/fallacious/fatuous
Fallacious & Fatuous. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/fallacious/fatuous>.
Fatuous or Fallacious. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/fallacious/fatuous.
Google Ngram Viewer shows how "fallacious" and "fatuous" have occurred on timeline