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
And where leadership believes their infrastructure is impenetrable, red teams often walk through the front door with nothing more than confidence and a cover story.
—
Jochen Schwenk, Forbes.com, 4 June 2025
To say that this film is impenetrable is an understatement.
—Sophie Monks Kaufman, IndieWire, 22 May 2025
Growing pressure Still, this spiritual shield is not impenetrable.
—Ogar Monday, Christian Science Monitor, 8 May 2025
But the paranoia of the missing papers was impenetrable.
—Ron Grossman, Chicago Tribune, 9 Mar. 2025
See All Example Sentences for impenetrable
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Jochen Schwenk, Forbes.com, 4 June 2025
To say that this film is impenetrable is an understatement.
—Sophie Monks Kaufman, IndieWire, 22 May 2025
Growing pressure Still, this spiritual shield is not impenetrable.
—Ogar Monday, Christian Science Monitor, 8 May 2025
But the paranoia of the missing papers was impenetrable.
—Ron Grossman, Chicago Tribune, 9 Mar. 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 16 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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