Uncertain and Unsure

Uncertain

Uncertain adjective - Not feeling sure about the truth, wisdom, or trustworthiness of someone or something.
Usage example: never uncertain of her political beliefs or judgment, she was a decisive and fearless leader

Unsure is a synonym for uncertain in certain topic. In some cases you can use "Unsure" instead an adjective "Uncertain", when it comes to topics like doubtful, hesitant, unstable, vague. popular alternative

Nearby Words: uncertainty, uncertainly

Unsure

Unsure adjective - Not feeling sure about the truth, wisdom, or trustworthiness of someone or something.
Usage example: unsure of her ability to handle the pressure of competing in the Olympic Games

Uncertain is a synonym for unsure in certain topic. You can use "Uncertain" instead an adjective "Unsure", if it concerns topics such as dubious, ambiguous, doubtful, unstable. popular alternative
Cite this Source
Unsure and Uncertain. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/uncertain/unsure
Uncertain & Unsure. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/uncertain/unsure>.
Unsure or Uncertain. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/uncertain/unsure.
Google Ngram Viewer shows how "uncertain" and "unsure" have occurred on timeline