Fallacious
Fallacious adjective - Not using or following good reasoning.
Vacuous and fallacious are semantically related. In some cases you can use "Vacuous" instead an adjective "Fallacious".
Vacuous
Vacuous adjective - Not having or showing an ability to absorb ideas readily.
Usage example: a movie that was enthusiastically derided for its vacuous dialogue
Fallacious and vacuous are semantically related. Sometimes you can use "Fallacious" instead an adjective "Vacuous".
Mutual synonyms
Cite this Source
Vacuous and Fallacious. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/fallacious/vacuous
Fallacious & Vacuous. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/fallacious/vacuous>.
Vacuous or Fallacious. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/fallacious/vacuous.
Google Ngram Viewer shows how "fallacious" and "vacuous" have occurred on timeline