as in vulnerable
lacking protection from danger or resistance against attack
the cowardly soldiers fled, leaving the palace undefended
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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
-
Bronson, with the atomic scientists group, also said nuclear plants are vulnerable during conflicts, citing recent instances where reactors were specifically targeted during the Iran war and the Russia-Ukraine War.—
ABC News,
ABC News,
17 Apr. 2026
-
Overwatering can leave grass with weak roots and vulnerable to diseases, so stick to a schedule and spot-treat patches if needed.—
Nishaa Sharma,
The Spruce,
17 Apr. 2026
Adjective
-
The show’s name referred to their self-identification as helpless babies overwhelmed by the pressures of modernity, comforted only by coating themselves in fancy serums and moisturizers to recreate the peaceful, placental insulation of the womb.—
Literary Hub,
Literary Hub,
9 Apr. 2026
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Then there’s the title character, who at first impression could be a helpless goldfish just waiting for any one of these alley cats to knock over her bowl and swallow her tail and all.—
Greg Evans,
Deadline,
6 Apr. 2026
Adjective
-
Just like any living creature, trees are susceptible to diseases.—
Tessa Cooper,
The Spruce,
18 Apr. 2026
-
Because there’s something about Toni Collette as a charismatic cult leader offering you a framework for your rage that feels like something Mae Martin would be susceptible to.—
Brittany Delay,
Mercury News,
17 Apr. 2026
Adjective
-
Water will cause any unprotected steel or iron to rust.—
Tim Carter,
Hartford Courant,
11 Apr. 2026
-
That has left people in the area feeling unprotected.—
Lauren Frayer,
NPR,
5 Apr. 2026
Cite this Entry
“Undefended.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/undefended. Accessed 21 Apr. 2026.
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