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impenetrable /ɪmˈpɛnətrəbəl/  

  • adjective
    [more ~; most ~]
    impossible to pass or see through
    an impenetrable wall/barrier/jungle
    The fort's defenses were thought to be impenetrable.
    impenetrable darkness/fog
    impossible to understand
    an impenetrable mystery
    an impenetrable secret code