| center(noun, verb, point, loose, outside) | |
| middle(noun, adjective, extreme, center, central) | |
| inside(noun, adjective, preposition, center) | |
| interior(noun, adjective, center) | |
| core | |
| area | |
| territory(noun, center) | |
| heart(noun, body, cruelty, cowardice) | |
| mainland(noun, center) | |
| within | |
| back country | |
| eye | |
| free(verb, loose) | |
| home | |
| midland(adjective, middle, middlemost) | |
| within reason | |
| region(noun, center) | |
| infinity | |
| be inside(verb, expression, idiom, loose, rimming) | |
| inland(adjective, middle, interior, coastal, middlemost) |
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| APA | Smart Define. (2016). border thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/border/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "border thesaurus" https://smartdefine.org/border/thesaurus/antonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, border thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/border/thesaurus/antonyms>. |
| MLA | Smart Define. "border thesaurus" 30 March 2016. Web. 22 September 2026. <https://smartdefine.org/border/thesaurus/antonyms> |