Surefire and Unsure
Opposite meaning words
Surefire
Surefire adjective - Not likely to fail.
Unsure
Unsure adjective - Not feeling sure about the truth, wisdom, or trustworthiness of someone or something.
Cite this Source
Unsure and Surefire. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/surefire/unsure
Surefire & Unsure. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/surefire/unsure>.
Unsure or Surefire. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/surefire/unsure.
Google Ngram Viewer shows how "surefire" and "unsure" have occurred on timeline