Extinct
Extinct adjective - No longer existing.
Unknown and extinct are semantically related. in dead topic. In some cases you can use "Unknown" instead an adjective "Extinct".
Nearby Word: extinction
Unknown
Unknown adjective - Happening or existing without one's knowledge.
Extinct and unknown are semantically related. Sometimes you can replace term "Extinct" with "Unknown", this adjectives are similar.
Nearby Words: unknowable, unknowing
Mutual synonyms
Both words in one sentence
- After Spotify took their songs down for an unknown reason, Critical Zone seemingly went extinct.
- That means that there was once a time when only 50 women (and an unknown number of men) were the only survivors of something that nearly made humanity extinct.
Source: After The End / Real Life - Synopsis:Crossover between Starwars and Prototype: During the old republic, a team of scientists discover an extinct civilization on an unknown world far out in the outer rim.
Source: Fanfic Recs / [PROTOTYPE]
Cite this Source
Unknown and Extinct. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/extinct/unknown
Extinct & Unknown. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/extinct/unknown>.
Unknown or Extinct. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/extinct/unknown.
Google Ngram Viewer shows how "extinct" and "unknown" have occurred on timeline