Once
Once adjective - Having been such at some previous time.
Usage example: the once child star is now a lawyer in the entertainment industry
Prospective is an antonym for once.
Prospective
Prospective adjective - Of or concerned with or related to the future.
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Synonyms for Prospective
Once is an antonym for prospective.
Both words in one sentence
- Harry Dresden of The Dresden Files once said that he got a note from a prospective carjacker offering to steal him something better.
Source: Stolen Good, Returned Better -
As the Castle informed Agatha that once her ancestress sent two hundred warrior homunculi in a little invasion... just to get acquainted with a prospective fiance.
Source: Our Homunculi Are Different - Simon Cowell once said that none of a bunch of prospective groups he was overseeing for The X Factor would be successful in "a million, billion years" and that no teenage girl would hang posters of them on her wall.
Cite this Source
Prospective and Once. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/once/prospective
Once & Prospective. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/once/prospective>.
Prospective or Once. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/once/prospective.
Google Ngram Viewer shows how "once" and "prospective" have occurred on timeline