Insane and Preposterous

Insane

Insane adjective - Conceived or made without regard for reason or reality.
Usage example: a completely insane plan to build an opera house in the middle of nowhere

Preposterous is a synonym for insane in foolish topic. In some cases you can use "Preposterous" instead an adjective "Insane", when it comes to topics like ability, stupid, extremely foolish. popular alternative

Nearby Words: insanity, insanely

Preposterous

Preposterous adjective - Conceived or made without regard for reason or reality.
Usage example: the idea that extraterrestrials built the pyramids is preposterous

Insane is a synonym for preposterous in ridiculous topic. You can use "Insane" instead an adjective "Preposterous", if it concerns topics such as ability, foolish, absurd. popular alternative
Cite this Source
Preposterous and Insane. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/insane/preposterous
Insane & Preposterous. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/insane/preposterous>.
Preposterous or Insane. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/insane/preposterous.
Google Ngram Viewer shows how "insane" and "preposterous" have occurred on timeline