An impenetrable shield is a defense that is very difficult to break through. It's also an adjective that describes something that is very difficult to understand or understand clearly.
The shield was impenetrable, and the soldiers couldn't break through it no matter how many times they tried.
The explanation was impenetrable, and the students were not able to understand it.
adjective
permitting little if any light to pass through because of denseness of matter
Synonyms:
adjective
impossible to understand
adjective
not admitting of penetration or passage into or through
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It's impenetrable to the layman.
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The nights here are impenetrable.
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The article is completely impenetrable to laypersons.
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The intro is impenetrable for a layman and is narrow in scope.
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The langauge in this article is at times amazingly impenetrable.
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Slide software can make impenetrable subjects mesmerizing.
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His men became entangled and immobilised in the impenetrable mire.
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The huge pile of names in the last part of the article is impenetrable.
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Black powder allowed the mining of previously impenetrable metals and ores.
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Bourdieu is both a superb stylist and the auther of some impenetrable prose.