Known
Known adjective - Apprehended with certainty.
Usage example: a known criminal
Undiscovered is an antonym for known.
Undiscovered
Both words in one sentence
- But Isis has secrets undiscovered by humanity, and Zoe herself contains secrets known only to the political powers that created her.
Source: Creator / Robert Charles Wilson - Ted's Caving Page (also known as Ted the Caver in some parts of the internet) is a Web Serial Novel detailing the attempts of spelunker Ted and his two friends to explore a strange, undiscovered portion of a local cave.
Source: Literature / Ted's Caving Page -
Rene Auberjonois, known as Odo on Star Trek: Deep Space Nine, may have looked familiar to viewers if his role as the villainous human, Colonel West, in Star Trek VI: The Undiscovered Country,, hadn't ended up on the cutting room floor.
Source: You Look Familiar
Cite this Source
Undiscovered and Known. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/known/undiscovered
Known & Undiscovered. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/known/undiscovered>.
Undiscovered or Known. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/known/undiscovered.
Google Ngram Viewer shows how "known" and "undiscovered" have occurred on timeline