Questionable and Unsure

Questionable

Questionable adjective - Giving good reason for being doubted, questioned, or challenged.

Unsure is a synonym for questionable in certain topic. In some cases you can use "Unsure" instead an adjective "Questionable", when it comes to topics like ambiguous, tenuous, uncertain, undependable.

Unsure

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

Questionable is a synonym for unsure in certain topic. You can use "Questionable" instead an adjective "Unsure", if it concerns topics such as ambiguous, tenuous, undependable.
Cite this Source
Unsure and Questionable. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/questionable/unsure
Questionable & Unsure. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/questionable/unsure>.
Unsure or Questionable. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/questionable/unsure.
Google Ngram Viewer shows how "questionable" and "unsure" have occurred on timeline