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
Its success may hold lessons in a market that has become increasingly impenetrable to content from outside the mainstream.
—
Patrick Frater, Variety, 11 Apr. 2024
While cybercriminals are forever prying at the steel door that is online security, companies like Cox Communications continue to invest in the latest technology to innovate and make sure that door is impenetrable.
—Advertorial, Orange County Register, 10 Apr. 2024
Some observers speculate that Putin, an impenetrable and often seemingly isolated figure, is the only person who fully believed the Kabuki theater of Russia’s election.
—Catherine Belton, Washington Post, 18 Mar. 2024
But one area that remains impenetrable to most players is figuring out the best ammo types.
—Mike Stubbs, Forbes, 19 Feb. 2024
Learn to craft weapons, armor, tools and more along with creating an impenetrable fortress.
—The Arizona Republic, 5 Mar. 2024
The web of parties controlling the prescription value chain, PBMs being at the forefront, have forged a system that routinely inflates the cost of medication beyond reason and have, so far, proven impenetrable to reform.
—Seth Joseph, Forbes, 15 Feb. 2024
Both Hezbollah and the Houthis have deployed precision missiles and drones in their attacks, and although Israel has impressive defense capabilities against ballistic missiles, cruise missiles, and drones, its defenses are not impenetrable.
—Amos Yadlin, Foreign Affairs, 8 Mar. 2024
His graying, thinning hair, tense figure and pouchy eyes could pierce Larry’s otherwise impenetrable ego.
—Boris Kachka, Washington Post, 29 Feb. 2024
Patrick Frater, Variety, 11 Apr. 2024
While cybercriminals are forever prying at the steel door that is online security, companies like Cox Communications continue to invest in the latest technology to innovate and make sure that door is impenetrable.
—Advertorial, Orange County Register, 10 Apr. 2024
Some observers speculate that Putin, an impenetrable and often seemingly isolated figure, is the only person who fully believed the Kabuki theater of Russia’s election.
—Catherine Belton, Washington Post, 18 Mar. 2024
But one area that remains impenetrable to most players is figuring out the best ammo types.
—Mike Stubbs, Forbes, 19 Feb. 2024
Learn to craft weapons, armor, tools and more along with creating an impenetrable fortress.
—The Arizona Republic, 5 Mar. 2024
The web of parties controlling the prescription value chain, PBMs being at the forefront, have forged a system that routinely inflates the cost of medication beyond reason and have, so far, proven impenetrable to reform.
—Seth Joseph, Forbes, 15 Feb. 2024
Both Hezbollah and the Houthis have deployed precision missiles and drones in their attacks, and although Israel has impressive defense capabilities against ballistic missiles, cruise missiles, and drones, its defenses are not impenetrable.
—Amos Yadlin, Foreign Affairs, 8 Mar. 2024
His graying, thinning hair, tense figure and pouchy eyes could pierce Larry’s otherwise impenetrable ego.
—Boris Kachka, Washington Post, 29 Feb. 2024
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 23 Apr. 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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