Assume
Assume verb - To form an opinion from little or no evidence.
Usage example: as I just assumed it was too late to go out, I didn't think to ask
Demonstrate is an antonym for assume.
Nearby Words: assumption, assuming
Demonstrate
Demonstrate verb - To show the existence or truth of by evidence.
Usage example: the paleontologist hopes to demonstrate that dinosaurs once existed in central Peru by unearthing the fossil evidence
Assume is an antonym for demonstrate.
Common collocations
Both words in one sentence
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In fact Miyashita made it worse by using his thin-worn trope of having someone demonstrate that the hazards in the fight are real, so one couldn't even assume it wasn't actually acid.
Source: Manga / Sakigake!! Otokojuku - In A Brother's Price, in his first encounter with the youngest princesses (about eight years old), Jerin uses this to demonstrate why someone should know how to spot being deceived, rather than simply assume everyone's honest.
Source: Shell Game - Given that a lot of people just assume "No, I'm not interested" to mean "Keep pressing and bugging me more - maybe I'll demonstrate interest", this is a VERY solid Aesop.
Cite this Source
Demonstrate and Assume. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/assume/demonstrate
Assume & Demonstrate. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/assume/demonstrate>.
Demonstrate or Assume. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/assume/demonstrate.
Google Ngram Viewer shows how "assume" and "demonstrate" have occurred on timeline