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
This sweetly reticent follow-up is a drama about the impenetrable singularity of a young girl’s mind.
—
Justin Chang, New Yorker, 26 May 2025
Things only get less interesting as that love triangles widens into an awkward kind of square, the chiaroscuro splendor of Soderbergh’s cinematography laboring to compensate for a murder-mystery that’s as scattered and impenetrable as Berlin itself.
—David Ehrlich, IndieWire, 14 Mar. 2025
Cybersecurity strategy has undergone a fundamental shift—from aspiring to build impenetrable defenses to accepting that breaches are inevitable.
—Tony Bradley, Forbes.com, 15 May 2025
But in person, nothing about her seems impenetrable.
—Thania Garcia, Variety, 9 May 2025
See All Example Sentences for impenetrable
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Justin Chang, New Yorker, 26 May 2025
Things only get less interesting as that love triangles widens into an awkward kind of square, the chiaroscuro splendor of Soderbergh’s cinematography laboring to compensate for a murder-mystery that’s as scattered and impenetrable as Berlin itself.
—David Ehrlich, IndieWire, 14 Mar. 2025
Cybersecurity strategy has undergone a fundamental shift—from aspiring to build impenetrable defenses to accepting that breaches are inevitable.
—Tony Bradley, Forbes.com, 15 May 2025
But in person, nothing about her seems impenetrable.
—Thania Garcia, Variety, 9 May 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 10 Jun. 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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