Borderline
Borderline adjective - Located at or near a border.
Usage example: a borderline region that is claimed by both countries
Outer and borderline are semantically related. In some cases you can use "Outer" instead an adjective "Borderline".
Nearby Words: border, borderland
Outer
Outer adjective - Situated on the outside or farther out.
Borderline and outer are semantically related. Sometimes you can use "Borderline" instead an adjective "Outer".
Both words in one sentence
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The "borderline" descriptor is for two reasons: Firstly, the Far Realm is not the same thing as outer spaaaaaace but is rather an incomprehensible plane of existence inspired by Lovecraftian horror.
Source: Humanoid Aliens - A borderline example in The X-Files episode "Jose Chung's 'From Outer Space'", there is an Man In Black who keeps to the shadows throughout the episode, but is eventually revealed to look like Alex Trebek (because he was played by him).
Source: Resemblance Reveal - Capu2 exaggerated said Tsundere tendencies to make her a borderline Jerkass, and turned her preference for Inner Moka into full-blown hatred for Outer Moka to the extent that Kokoa flat-out refuses to acknowledge Outer Moka as her sister.
Source: Character Exaggeration
Cite this Source
Outer and Borderline. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/borderline/outer
Borderline & Outer. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/borderline/outer>.
Outer or Borderline. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/borderline/outer.
Google Ngram Viewer shows how "borderline" and "outer" have occurred on timeline