Hidden
Hidden adjective - Screened or sequestered from view.
Unknown
Unknown adjective - Happening or existing without one's knowledge.
Hidden is a synonym for unknown in obscure topic. You can use "Hidden" instead an adjective "Unknown", if it concerns topics such as concealed or secret, undisclosed.
Nearby Words: unknowable, unknowing
Mutual synonyms
Both words in one sentence
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Aaron had a car parked in an unknown location with similar items hidden inside one of the doors.
Source: Film / The Bourne Series -
A similar tale is told in book 6 about King Fridleif, who on a sea-journey is driven to an unknown island where a treasure is hidden in an underground chamber, guarded by a sea-dragon.
Source: Literature / Gesta Danorum -
Unknown to the casino owners, the wheel was one gimmicked to drop inside the table when a hidden switch is hit (which is why her client wanted it stolen).
Source: Hidden in Plain Sight
Cite this Source
Unknown and Hidden. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/hidden/unknown
Hidden & Unknown. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/hidden/unknown>.
Unknown or Hidden. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/hidden/unknown.
Google Ngram Viewer shows how "hidden" and "unknown" have occurred on timeline