Fallacious
Fallacious adjective - Not using or following good reasoning.
Vain and fallacious are semantically related. In some cases you can use "Vain" instead an adjective "Fallacious".
Vain
Vain adjective - Having too high an opinion of oneself.
Fallacious and vain are semantically related. Sometimes you can use "Fallacious" instead an adjective "Vain".
Cite this Source
Vain and Fallacious. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/fallacious/vain
Fallacious & Vain. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/fallacious/vain>.
Vain or Fallacious. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/fallacious/vain.
Google Ngram Viewer shows how "fallacious" and "vain" have occurred on timeline