Borderline
Borderline adjective - Located at or near a border.
Usage example: a borderline region that is claimed by both countries
Frontier is a synonym for borderline in border topic. In some cases you can use "Frontier" instead the word "Borderline" as a noun or an adjective, when it comes to topics like boundary, perimeter. popular alternative
Nearby Words: border, borderland
Frontier
Frontier adjective - Located at or near a border.
Usage example: a frontier town with a reputation for vice and lawlessness
Borderline is a synonym for frontier in border topic. You can use "Borderline" instead the word "Frontier" as a noun or an adjective, if it concerns topics such as boundary, perimeter. popular alternative
Nearby Word: frontiersman
Mutual synonyms
Both words in one sentence
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Arboreal Abode: Frontier Village takes it to an extreme, being a 9-level borderline Layered Metropolis inside a gigantic hollow tree.
Source: Videogame / Xenoblade
Cite this Source
Frontier and Borderline. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/borderline/frontier
Borderline & Frontier. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/borderline/frontier>.
Frontier or Borderline. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/borderline/frontier.
Google Ngram Viewer shows how "borderline" and "frontier" have occurred on timeline