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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

Others — often referred to as “me too” drugs — are chemically or mechanistically similar to existing therapies, designed to compete within established categories rather than to open new frontiers.

From MarketWatch • Apr. 15, 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

“I do not believe that financial insecurity should stop our nation’s elite athletes from breaking through to new frontiers of excellence,” Stevens said.

From The Wall Street Journal • Jan. 27, 2026

A new kind of hero emerged as well—a hero willing to sacrifice self to explore new frontiers.

From "Women in Space" by Karen Bush Gibson