vulnerable

adjective

vul·​ner·​a·​ble ˈvəl-n(ə-)rə-bəl How to pronounce vulnerable (audio)
ˈvəl-nər-bəl
Synonyms of vulnerablenext
1
: capable of being easily hurt or harmed physically, mentally, or emotionally
The patient may be more vulnerable to infection immediately after surgery.
The lenses in children's eyes are clear and thus more vulnerable to light.—Anna Webb
2
: open to attack, harm, or damage : assailable
vulnerable to criticism
The fort was undefended and vulnerable.
Your computer may be vulnerable to viruses.
3
: liable to increased penalties but entitled to increased bonuses after winning a game in contract bridge

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The History of Vulnerable

Superheroes are often depicted in comic books and movies as all-powerful, deflecting boulders and missiles in mid-air with a flick of the wrist, walking through walls, and having indestructible skeletons and whatnot. Fans know, however, that even the mightiest, meatiest protagonist is vulnerable to something, be it kryptonite or forgetting the whereabouts of one’s hammer. Vulnerable ultimately comes from the Latin noun vulnus, meaning “wound,” by way of the Late Latin adjective vulnerabilis, which English speakers adopted as vulnerable in the early 1600s. Vulnerable continues to carry its original meaning of “capable of being physically wounded,” but since the late 1600s it has also been used figuratively to suggest a defenselessness against non-physical attacks. In other words, someone (or something) can be vulnerable to criticism or failure as well as to literal wounding—even superheroes. So don’t go breaking their hearts, even if you can’t break their bones.

Examples of vulnerable in a Sentence

He was very vulnerable after his divorce. The troops were in a vulnerable position. The fort was undefended and vulnerable.
Recent Examples on the Web
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.
Some moderate flooding is possible in vulnerable back-bay communities before conditions gradually improve Thursday. — Grant Gilmore, CBS News, 20 Oct. 2026 And just as the Eaton fire set low-income Black families further back than those with more resources to rebuild, many of the changes in the state’s climate will hit the most vulnerable hardest. — Blanca Begert, Los Angeles Times, 20 Oct. 2026 The exception appears to be Edge running on Windows 10, which at the time this article went live was still connecting to 12 vulnerable hosts. — Dan Goodin, ArsTechnica, 20 Oct. 2026 Energy that is produced, generated, or stored at home is often more reliable than energy that must travel through vulnerable supply chains and geopolitical chokepoints. — Dr. Sarah Kapnick, semafor.com, 20 Oct. 2026 See All Example Sentences for vulnerable

Word History

Etymology

Late Latin vulnerabilis, from Latin vulnerare to wound, from vulner-, vulnus wound; probably akin to Latin vellere to pluck, Greek oulē wound

First Known Use

circa 1616, in the meaning defined at sense 1

Time Traveler
The first known use of vulnerable was circa 1616

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Cite this Entry

“Vulnerable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vulnerable. Accessed 22 Oct. 2026.

Kids Definition

vulnerable

adjective
vul·​ner·​a·​ble ˈvəln-(ə-)rə-bəl How to pronounce vulnerable (audio)
ˈvəl-nər-bəl
1
: capable of being physically or emotionally wounded
2
: open to attack or damage
a vulnerable position

Medical Definition

: capable of being hurt : susceptible to injury or disease
the liver is itself vulnerable to nutritional impairment—The Journal of the American Medical Association
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