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
Synonyms
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
Griffith Observatory is a functioning observatory built to look at the stars through, at times, impenetrable light and atmospheric pollution.
—
Lily Moayeri, SPIN, 2 July 2024
Oh, and an impenetrable penalty kill that has stopped 46 of the opponents’ last 47 power play chances.
—Greg Cote, Miami Herald, 22 June 2024
The Point Reyes Peninsula, surrounded by cold, churning waters, treacherous crags and impenetrable fog, has spelled doom for generations of seafarers.
—Hailey Branson-Potts, Los Angeles Times, 14 June 2024
Understanding what an insurance company does or doesn’t cover, what Connecticut allows or requires it to cover, and the minefields that may be all over insurance policies can be nothing short of impenetrable.
—Jan Ellen Spiegel, Hartford Courant, 25 May 2024
See all Example Sentences for impenetrable 
Lily Moayeri, SPIN, 2 July 2024
Oh, and an impenetrable penalty kill that has stopped 46 of the opponents’ last 47 power play chances.
—Greg Cote, Miami Herald, 22 June 2024
The Point Reyes Peninsula, surrounded by cold, churning waters, treacherous crags and impenetrable fog, has spelled doom for generations of seafarers.
—Hailey Branson-Potts, Los Angeles Times, 14 June 2024
Understanding what an insurance company does or doesn’t cover, what Connecticut allows or requires it to cover, and the minefields that may be all over insurance policies can be nothing short of impenetrable.
—Jan Ellen Spiegel, Hartford Courant, 25 May 2024
See all Example Sentences for impenetrable
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'impenetrable.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Dictionary Entries Near impenetrable
Cite this Entry
“Impenetrable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/impenetrable. Accessed 7 Jul. 2024.
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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