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frontiers

NOUN

boundary

Synonyms

STRONG

borderland borderline bound confines edge limit march perimeter verge

Antonyms

STRONG

center inside interior middle

WEAK

metropolis

NOUN

unexplored, unoccupied area of land

Synonyms

STRONG

backwater backwoods boondocks bush hinterland outback outskirts sticks unknown

WEAK

backcountry boonies

Antonyms

WEAK

metropolis

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Pyongyang closed its borders in January 2020 to stop the spread of the coronavirus, with research and media reports indicating that the diplomatically isolated nation spent subsequent years bolstering security along its frontiers.

From Barron's • Apr. 28, 2026

But the movie itself isn’t exactly exploring new frontiers of fear, devolving instead into a familiar slasher-thriller with a climax of strained characterization and confusing spatial logic.

From The Wall Street Journal • Apr. 9, 2026

It also snapped up new talent — and new exploration frontiers — when it acquired Hess last year.

From MarketWatch • Mar. 3, 2026

But the EU border agency said last year that it was reviewing 12 cases of potential human rights violations by Greece, including some allegations that migrants seeking asylum were pushed back from Greece's frontiers.

From BBC • Feb. 4, 2026

How mad the frontiers had seemed to Lyo-lyok, and would to Man if he could learn to fly.

From "The Once and Future King" by T. H. White