Preposterous
Preposterous adjective - Conceived or made without regard for reason or reality.
Suppositious and preposterous are semantically related. In some cases you can use "Suppositious" instead an adjective "Preposterous".
Suppositious
Suppositious adjective - Based primarily on surmise rather than adequate evidence.
Show all Definitions
Synonyms for Suppositious
Preposterous and suppositious are semantically related. Sometimes you can use "Preposterous" instead an adjective "Suppositious".
Mutual synonyms
Cite this Source
Suppositious and Preposterous. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/preposterous/suppositious
Preposterous & Suppositious. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/preposterous/suppositious>.
Suppositious or Preposterous. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/preposterous/suppositious.
Google Ngram Viewer shows how "preposterous" and "suppositious" have occurred on timeline