Frontier
Frontier adjective - Located at or near a border.
Unknown and frontier are semantically related. in unexplored topic. In some cases you can use "Unknown" instead the word "Frontier" as a noun or an adjective.
Nearby Word: frontiersman
Unknown
Unknown adjective - Happening or existing without one's knowledge.
Frontier and unknown are semantically related. Sometimes you can use "Frontier" instead an adjective "Unknown".
Nearby Words: unknowable, unknowing
Mutual synonyms
Both words in one sentence
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In the Guilty Gear universe, Elemental Magic is hard science, with ki representing the final frontier of the unknown.
Source: Ki Manipulation -
The frontier as a whole was traditionally viewed (and still is viewed, to some extent) as the meeting place of civilization and the unknown.
Source: Weird West - Running around the frontier exploring new systems, making First Contact with unknown alien races, and occasionally acting as lawmen.
Cite this Source
Unknown and Frontier. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/frontier/unknown
Frontier & Unknown. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/frontier/unknown>.
Unknown or Frontier. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/frontier/unknown.
Google Ngram Viewer shows how "frontier" and "unknown" have occurred on timeline