For certain and Unsure

Opposite meaning terms

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

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Unsure is an antonym for for certain in topics: certain, definite.

Unsure adjective - Not feeling sure about the truth, wisdom, or trustworthiness of someone or something.

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For certain is an antonym for unsure.

Cite this Source

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

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

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

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