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English definition of “impenetrable”

impenetrable

adjective  /ɪmˈpen·ɪ·trə·bəl/ us  
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)
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