For sure and Unsure

Opposite meaning terms

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

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Unsure is an antonym for for sure.

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

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For sure is an antonym for unsure.

Cite this Source

Unsure and For sure. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/for_sure/unsure

For sure & Unsure. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/for_sure/unsure>.

Unsure or For sure. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/for_sure/unsure.

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