Definition of “impenetrable” - English Dictionary

“impenetrable” in British English

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uk /ɪmˈpen.ɪ.trə.bəl/ us /ɪmˈpen.ə.trə.bəl/

impossible to see through or go through:

Outside, the fog was thick and impenetrable.
an impenetrable barrier

impossible to understand:

Some of the lyrics on their latest album are completely impenetrable.
adverb uk /ɪmˈpen.ɪ.trə.bli/ us /ɪmˈpen.ə.trə.bli/

(Definition of “impenetrable” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“impenetrable” in American English

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us /ɪmˈpen·ɪ·trə·bəl/

impossible to enter or go through:

an impenetrable jungle

If language is described as impenetrable, it is impossible to understand:

Too many scholarly books are written in an impenetrable jargon.

(Definition of “impenetrable” from the Cambridge Academic Content Dictionary © Cambridge University Press)