Harebrained and Preposterous

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

Preposterous is a synonym for harebrained in ability topic. In some cases you can use "Preposterous" instead an adjective "Harebrained", when it comes to topics like stupid.

Preposterous

Preposterous adjective - Showing or marked by a lack of good sense or judgment.
Usage example: a preposterous suggestion to go swimming in this freezing weather

Harebrained is a synonym for preposterous in ability topic. You can use "Harebrained" instead an adjective "Preposterous", if it concerns topics such as ridiculous.
Cite this Source
Preposterous and Harebrained. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/harebrained/preposterous
Harebrained & Preposterous. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/harebrained/preposterous>.
Preposterous or Harebrained. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/harebrained/preposterous.
Google Ngram Viewer shows how "harebrained" and "preposterous" have occurred on timeline