For certain and Unknown

Opposite meaning terms

For certain adverb - Definitely or positively (`sure' is sometimes used informally for `surely').

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Unknown is an antonym for for certain in certain topic.

Unknown adjective - Happening or existing without one's knowledge.

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For certain is an antonym for unknown.

Nearby Words: unknowable, unknowing

Cite this Source

Unknown and For certain. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/for_certain/unknown

For certain & Unknown. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/for_certain/unknown>.

Unknown or For certain. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/for_certain/unknown.

Google Ngram Viewer shows how "for certain" and "unknown" have occurred on timeline