as in vulnerable
lacking protection from danger or resistance against attack
the cowardly soldiers fled, leaving the palace undefended
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Example Sentences
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Recent Examples of undefended
Trouba opened the scoring in the first period with an undefended slap shot after an egregious Blackhawks turnover.
—
CBS News, 7 Dec. 2025
Mark Collins, who was born and raised in Newfoundland, Canada, said Canadians have long treasured their friendship with the United States and the fact that the US-Canada border is the longest undefended border on the planet.
—Matt Egan, CNN Money, 13 Oct. 2025
Even with changes that came after the 2001 terrorist attacks, Abdool, noting the reputation of the longest undefended border in the world, said the experience of traveling back and forth between the United States and Canada wasn’t like crossing other international borders.
—Eric D. Lawrence, Freep.com, 16 May 2025
Well, turns out that Dragonstone is pretty undefended now, too.
—James Grebey, Vulture, 4 Aug. 2024
See All Example Sentences for undefended
CBS News, 7 Dec. 2025
Mark Collins, who was born and raised in Newfoundland, Canada, said Canadians have long treasured their friendship with the United States and the fact that the US-Canada border is the longest undefended border on the planet.
—Matt Egan, CNN Money, 13 Oct. 2025
Even with changes that came after the 2001 terrorist attacks, Abdool, noting the reputation of the longest undefended border in the world, said the experience of traveling back and forth between the United States and Canada wasn’t like crossing other international borders.
—Eric D. Lawrence, Freep.com, 16 May 2025
Well, turns out that Dragonstone is pretty undefended now, too.
—James Grebey, Vulture, 4 Aug. 2024
See All Example Sentences for undefended
Recent Examples of Synonyms for undefended
Adjective
-
But if the jumpers go cold, the Tide will be vulnerable to a first-round upset.—
Steven Louis Goldstein,
New York Times,
21 Mar. 2026
-
On a typical day, a significant share of oil exports from the Arabian Peninsula depends on just a handful of critical routes and terminals -- making the system highly vulnerable to disruption, according to Matt Smith, the lead oil analyst at energy consultant group Kpler.—
Victor Ordonez,
ABC News,
20 Mar. 2026
Adjective
-
That gave the last four minutes of the third quarter and the 36-27 fourth quarter a bit of a helpless feeling.—
Jon Krawczynski,
New York Times,
16 Mar. 2026
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In the meantime, Jones was stranded on an island of his own making Saturday, exasperated by another difficult game-winning shot that his wingspan was somehow helpless to affect on its own.—
Bennett Durando,
Denver Post,
15 Mar. 2026
Adjective
-
The decision to die is drastic and irreversible; should it really be left up to a young person whose brain is still developing, and who is susceptible to influence by peers and authority figures?—
Charles Lane,
The Atlantic,
15 Mar. 2026
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Cats are also very susceptible to acetaminophen (Tylenol) poisoning, which causes liver damage and impairs the ability of blood to carry oxygen (methemoglobinemia).—
The Washington Post,
San Diego Union-Tribune,
14 Mar. 2026
Adjective
-
Frost and freeze conditions will damage unprotected vegetation that is sensitive to freezing temperatures.—
STAR-TELEGRAM WEATHER BOT,
Fort Worth Star-Telegram,
16 Mar. 2026
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The two share the longest unprotected border in the world, at more than 5,500 miles.—
Jeanne Bonner,
CNN Money,
16 Mar. 2026
Cite this Entry
“Undefended.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/undefended. Accessed 22 Mar. 2026.
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