Unsure
Unsure adjective - Not feeling sure about the truth, wisdom, or trustworthiness of someone or something.
Unknown
Unknown adjective - Happening or existing without one's knowledge.
Unsure and unknown are semantically related in undetermined topic. Sometimes you can use "Unsure" instead an adjective "Unknown".
Nearby Words: unknowable, unknowing
Mutual synonyms
Cite this Source
Unknown and Unsure. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/unsure/unknown
Unsure & Unknown. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/unsure/unknown>.
Unknown or Unsure. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/unsure/unknown.
Google Ngram Viewer shows how "unsure" and "unknown" have occurred on timeline