Doubt and Surefire

Doubt

Doubt noun - A feeling or attitude that one does not know the truth, truthfulness, or trustworthiness of someone or something.

Surefire is an antonym for doubt.

Surefire

Surefire adjective - Not likely to fail.

Doubt is an antonym for surefire in positive assurance topic.
Cite this Source
Surefire and Doubt. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/doubt/surefire
Doubt & Surefire. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/doubt/surefire>.
Surefire or Doubt. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/doubt/surefire.
Google Ngram Viewer shows how "doubt" and "surefire" have occurred on timeline