UNDEFENDED Synonyms: 49 Similar and Opposite Words

undefended

adjective

ˌən-di-ˈfen-dəd

Definition of undefended

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

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

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. — 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

The song is written as a conversation with that mythic other woman, who Parton confronts here in a way that manages to come across as both extremely vulnerable and drawing on a huge reserve of strength.

— Ed Masley, USA Today, 26 Aug. 2026
For someone vulnerable to an eating disorder, [pressure] from social media, celebrity images, or the growing visibility of GLP-1 medications can reinforce restriction and the belief that their body is somehow not small enough.

— Marti Noxon, HollywoodReporter, 26 Aug. 2026

Definition of vulnerable

Adjective

In fact there are a number of herbs, vitamins, and prescription medications that can make your skin especially susceptible to sunburn, including some SSRIs, hypertension medications, and cholesterol-lowering medications.

— Diana Helmuth, Outdoor Life, 20 Aug. 2026
Child development experts have noted teenagers are more susceptible to social comparison than adults, so products that reward popularity can be more harmful to their mental health.

— ABC News, ABC News, 19 Aug. 2026

Definition of susceptible

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undefeated

undefended

undefiled

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“Undefended.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/undefended. Accessed 27 Aug. 2026.

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Synonyms of undefended

adjective

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