Fallacious
Fallacious adjective - Not using or following good reasoning.
Knuckleheaded and fallacious are semantically related. In some cases you can use "Knuckleheaded" instead an adjective "Fallacious".
Knuckleheaded
Knuckleheaded adjective - Not having or showing an ability to absorb ideas readily.
Usage example: the editorial lampooned the knuckleheaded legislation, which was yet another attempt by the government to protect people from themselves
Fallacious and knuckleheaded are semantically related. Sometimes you can use "Fallacious" instead an adjective "Knuckleheaded".
Mutual synonyms
Cite this Source
Knuckleheaded and Fallacious. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/fallacious/knuckleheaded
Fallacious & Knuckleheaded. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/fallacious/knuckleheaded>.
Knuckleheaded or Fallacious. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/fallacious/knuckleheaded.
Google Ngram Viewer shows how "fallacious" and "knuckleheaded" have occurred on timeline