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
The lack of range of Coastal Command aircraft left an undefended area known as the Mid-Atlantic Gap, rendering merchant shipping and their escorts without air cover and vulnerable to attack.
—
Mark Wood,
TheWeek,
7 Jan. 2026
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.
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Matt Egan,
CNN Money,
13 Oct. 2025
Like the global undersea cable network, the United States’ deep-water drilling infrastructure is rapidly expanding while remaining almost entirely undefended.
—
Robert Martinage,
Foreign Affairs,
1 Jan. 2015
See All Example Sentences for undefended
Mark Wood,
TheWeek,
7 Jan. 2026
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
Like the global undersea cable network, the United States’ deep-water drilling infrastructure is rapidly expanding while remaining almost entirely undefended.
—
Robert Martinage,
Foreign Affairs,
1 Jan. 2015
See All Example Sentences for undefended
Recent Examples of Synonyms for undefended
Adjective
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Key industries like agriculture, outdoor recreation, and the power grid are structurally vulnerable to water scarcity and extreme weather, exacerbated by climate change.
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The gang members and associates allegedly focused on recruiting vulnerable minor girls and young women, many of whom came from broken homes or had fallen through the foster care system, Essayli said Wednesday.
Adjective
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The leading interpretation is that Smilodon delivered a single precise bite to the throat or belly, severing something vital in a target that was already helpless.
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Pele controls the ball in the penalty area with his thigh, flips it over the head of the defender and smashes it past a helpless Kalle Svensson.
Adjective
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However, people with weakened immune systems or certain underlying health conditions may be more susceptible to infection.
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Cooking Oils Cooking oils high in unsaturated fats, such as olive, walnut, and flaxseed oils, are among the pantry items most susceptible to heat damage.
Adjective
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If your cat or dog is outdoors and unprotected, fleas hitch a ride and come indoors with them.
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The Celtics’ final offer to the Bucks included 29-year-old five-time NBA All-Star Jaylen Brown and two unprotected first-round picks, according to Charania.
Cite this Entry
“Undefended.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/undefended. Accessed 4 Jul. 2026.
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