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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

What happened to manned missions opening new frontiers?

From The Wall Street Journal • Apr. 15, 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

Hodgkinson's latest triumph leaves upgrading from silver to gold at the world outdoors and Commonwealths as the final frontiers as far as her international medal collection is concerned.

From BBC • Mar. 22, 2026

“And if during the night at one of the frontiers the Customs officials should require a piece of luggage to be opened?”

From "Murder on the Orient Express" by Agatha Christie