impenetrable

adjective

im·​pen·​e·​tra·​ble (ˌ)im-ˈpe-nə-trə-bəl How to pronounce impenetrable (audio)
1
a
: incapable of being penetrated or pierced
b
: inaccessible to knowledge, reason, or sympathy : impervious
2
: incapable of being comprehended : inscrutable
impenetrably adverb

Examples of impenetrable in a Sentence

The fort's defenses were thought to be impenetrable. the ancient temple was surrounded by vast stretches of impenetrable jungle
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.
Test Your Defenses Regularly No system is impenetrable, which is why continuous testing is essential. Julio Fort, Forbes, 3 Mar. 2025 If love is a conspiracy of two, impenetrable to outsiders, Iago finds a way to pierce through, seeding doubt about Desdemona in Othello. Maya Singer, Vogue, 27 Feb. 2025 The gold depository at Fort Knox has a reputation for being impenetrable, which has gained it a place in popular culture. CBS News, 21 Feb. 2025 Numerous incidents demonstrate that Macs are not impenetrable, and a new one has recently been added to the list. Kurt Knutsson, Cyberguy Report, Fox News, 15 Jan. 2025 See All Example Sentences for impenetrable

Word History

Etymology

Middle English impenetrabel, from Middle French impenetrable, from Latin impenetrabilis, from in- + penetrabilis penetrable

First Known Use

15th century, in the meaning defined at sense 1a

Time Traveler
The first known use of impenetrable was in the 15th century

Browse Nearby Words

Cite this Entry

“Impenetrable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/impenetrable. Accessed 14 Mar. 2025.

Kids Definition

impenetrable

adjective
im·​pen·​e·​tra·​ble (ˈ)im-ˈpen-ə-trə-bəl How to pronounce impenetrable (audio)
1
: impossible to get through or into
impenetrable walls
impenetrable jungle
2
: impossible to understand
an impenetrable mystery
impenetrability
(ˌ)im-ˌpen-ə-trə-ˈbil-ət-ē
noun
impenetrably adverb

More from Merriam-Webster on impenetrable

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