Certain
Inconceivable
Inconceivable adjective - Too extraordinary or improbable to believe.
Usage example: the formerly inconceivable idea that humans could land on the moon
Certain is an antonym for inconceivable.
Nearby Word: inconceivability
Both words in one sentence
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It's also worth noting that at a certain point of time pet parrots commanded huge prices in Europe, so it is not inconceivable for a sailor wanting to settle down to trade in several parrots as a retirement benefit of sorts, probably leaving one to himself — which is probably where it all started.
Source: Pirate Parrot
Cite this Source
Inconceivable and Certain. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/certain/inconceivable
Certain & Inconceivable. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/certain/inconceivable>.
Inconceivable or Certain. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/certain/inconceivable.
Google Ngram Viewer shows how "certain" and "inconceivable" have occurred on timeline