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Discover LudwigThe phrase "a impenetrable" is not correct in English.
It should be "an impenetrable" due to the vowel sound that follows the article. You can use it when describing something that cannot be penetrated or understood, often in a metaphorical sense.
Example: "The fortress was an impenetrable barrier against any attack."
Alternatives: "a non-penetrable" or "an unyielding".
Exact(2)
Ning had been a impenetrable fortress to me prior to that post – I just could not make contact with anyone senior (not that they owe that to me).
Given the witness discrepancies, conflicting reports, history of local government corruption and dubious police cooperation, there could well be a impenetrable web of intrigue behind this one.
Similar(56)
I mean, part of growing up for me was getting a finish, an impenetrable polish.
It certainly feels that way in "Heart of Darkness," in which we meet up with an impenetrable jungle, an impenetrable forest, an impenetrable landscape, an impenetrable night, and, twice, an impenetrable darkness.
A whimper and an impenetrable silence later, the cousins had lost their Camille.
Sometimes an impenetrable dance piece seems a lot more graspable a day later.
Roots about to encounter an impenetrable obstacle or a toxic substance change course before they make contact with it.
For journalists like me, Gulnara's love of extravaganzas offers a way to approach an impenetrable country.
She added: "For journalists like me, Gulnara's love of extravaganzas offers a way to approach an impenetrable country.
These attached bacteria become a sessile population with an impenetrable glycocalyx matrix coat.
The British sense of humor is both an invaluable broadsword and an impenetrable shield.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com