Definition of impenetrable adjective from the Oxford Advanced Learner's Dictionary

     

    impenetrable

     adjective
    adjective
    BrE BrE//ɪmˈpenɪtrəbl//
     
    ; NAmE NAmE//ɪmˈpenɪtrəbl//
     
     
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  1. 1that cannot be entered, passed through or seen through an impenetrable jungle impenetrable darkness opposite penetrable
  2. 2impossible to understand synonym incomprehensible an impenetrable mystery Her expression was impenetrable. impenetrable to somebody Their jargon is impenetrable to an outsider.
  3. Word Origin late Middle English: via French from Latin impenetrabilis, from in- ‘not’ + penetrabilis ‘able to be pierced’, from the verb penetrare; related to penitus ‘inner’.Extra examples I find his style somewhat impenetrable. The language of this document would be impenetrable to anyone except a specialist. They found the jungle virtually impenetrable. The camerawork is beautiful but the plot is impenetrable. The text would be impenetrable to the non-specialist reader.
See the Oxford Advanced American Dictionary entry: impenetrable