Unknown
Unknown adjective - Happening or existing without one's knowledge.
Unusual and unknown are semantically related. In some cases you can use "Unusual" instead an adjective "Unknown".
Nearby Words: unknowable, unknowing
Mutual synonyms
Cite this Source
Unusual and Unknown. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/unknown/unusual
Unknown & Unusual. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/unknown/unusual>.
Unusual or Unknown. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/unknown/unusual.
Google Ngram Viewer shows how "unknown" and "unusual" have occurred on timeline