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

An alignment takes place, as the legacy media consistently allows Rowling, as one of their own, to get away with removing trans women from their verifiable position as a vulnerable demographic.

— Literary Hub, Literary Hub, 5 Oct. 2026
The evening brought plenty of laughs, but also a recognition that the progress CAPE and the broader AAPI entertainment community have made remains vulnerable amid an industry facing contraction, layoffs, and shrinking opportunities.

— Destiny Jackson, Deadline, 5 Oct. 2026

Definition of vulnerable

Adjective

If a guy who was seven for 66 in the last two postseasons and was so helpless last year that he was benched for the last three games of the World Series … if that guy can drive in the winning run from the bottom of the order?

— Los Angeles Times, Los Angeles Times, 8 Oct. 2026
The law distinguishes that from being physically helpless or incapacitated by drugs administered without consent.

— Hallie Golden, Chicago Tribune, 3 Oct. 2026

Definition of helpless

Adjective

Up to 9 out of 10 people who are susceptible will get the virus if exposed, according to the Centers for Disease Control and Prevention.

— Arkansas Online, Arkansas Online, 6 Oct. 2026
The most susceptible areas will be Long Beach and the Avalon Harbor on Tuesday and Wednesday and then Malibu through Ventura County from Wednesday through Friday.

— Hannah Fry, Los Angeles Times, 5 Oct. 2026

Definition of susceptible

Adjective

But after being left unprotected from the expansion process in June, Jenner signed a three-year contract with Hamilton.

— Hailey Salvian, New York Times, 2 Oct. 2026
As a result of these changes, species are still listed on paper as endangered but are largely unprotected.

— Timothy Randhir, The Conversation, 1 Oct. 2026

Definition of unprotected

Browse Nearby Words

undefeated

undefended

undefiled

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Style

“Undefended.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/undefended. Accessed 9 Oct. 2026.

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Synonyms of undefended

adjective

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