Doubtful and Preposterous

Doubtful

Doubtful adjective - Not likely to be true or to occur.
Usage example: our winning the championship increasingly looks like a doubtful outcome

Preposterous and doubtful are semantically related. In some cases you can use "Preposterous" instead an adjective "Doubtful".

Preposterous

Preposterous adjective - Conceived or made without regard for reason or reality.

Doubtful and preposterous are semantically related. Sometimes you can use "Doubtful" instead an adjective "Preposterous".
Cite this Source
Preposterous and Doubtful. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/doubtful/preposterous
Doubtful & Preposterous. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/doubtful/preposterous>.
Preposterous or Doubtful. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/doubtful/preposterous.
Google Ngram Viewer shows how "doubtful" and "preposterous" have occurred on timeline