Fallacious
Fallacious adjective - Not using or following good reasoning.
Harebrained and fallacious are semantically related. In some cases you can use "Harebrained" instead an adjective "Fallacious".
Harebrained
Harebrained adjective - Showing or marked by a lack of good sense or judgment.
Usage example: a harebrained idea to go for a hike in an area where grizzly bear attacks had recently been reported
Fallacious and harebrained are semantically related. Sometimes you can use "Fallacious" instead an adjective "Harebrained".
Mutual synonyms
Cite this Source
Harebrained and Fallacious. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/fallacious/harebrained
Fallacious & Harebrained. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/fallacious/harebrained>.
Harebrained or Fallacious. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/fallacious/harebrained.
Google Ngram Viewer shows how "fallacious" and "harebrained" have occurred on timeline