Countless
Countless adjective - Too many to be counted.
Unknown
Unknown adjective - Happening or existing without one's knowledge.
Countless and unknown are semantically related. Sometimes you can use "Countless" instead an adjective "Unknown".
Nearby Words: unknowable, unknowing
Mutual synonyms
Both words in one sentence
- Originally Tyrómairon was sealed away on an unknown planet countless millenia ago and the prison could be considered one of these.
- In the Assassin's Creed franchise, both the Assassins and the Templars, as a result of their endless war and infiltration tactics, have become responsible for countless well-known (and unknown) crimes and major acts throughout history, with well-known historic figures on both sides of the conflict.
Source: Historical Rap Sheet -
The Iron Giant can do this to an amazing degree when the ending reveals that even after being blown up in the atmosphere by a nuclear explosion, his countless paperweight-sized pieces can be seen migrating to an unknown location so he can reassemble himself.
Source: Pulling Themselves Together
Cite this Source
Unknown and Countless. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/countless/unknown
Countless & Unknown. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/countless/unknown>.
Unknown or Countless. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/countless/unknown.
Google Ngram Viewer shows how "countless" and "unknown" have occurred on timeline