impenetrable
adjective
im·pen·e·tra·ble
(ˌ)im-ˈpe-nə-trə-bəl 
1
a
: incapable of being penetrated or pierced
b
: inaccessible to knowledge, reason, or sympathy : impervious
2
: incapable of being comprehended : inscrutable
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
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
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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
Cite this Entry
“Impenetrable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/impenetrable. Accessed 14 Mar. 2025.
Copy CitationKids Definition
impenetrable
adjective
im·pen·e·tra·ble
(ˈ)im-ˈpen-ə-trə-bəl
1
: impossible to get through or into
impenetrable walls
impenetrable jungle
2
: impossible to understand
an impenetrable mystery
impenetrability
noun
(ˌ)im-ˌpen-ə-trə-ˈbil-ət-ē
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