- 1that cannot be entered, passed through, or seen through an impenetrable jungle impenetrable darkness opposite penetrable
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- 2impossible to understand synonym incomprehensible an impenetrable mystery Her expression was impenetrable. impenetrable to somebody Their jargon is impenetrable to an outsider.
NAmE//ɪmˌpɛnətrəˈbɪlət̮i//
noun [uncountable] NAmE//ɪmˈpɛnətrəbli//
adverb an impenetrably obscure writerSee impenetrable in the Oxford Advanced Learner's DictionaryCheck pronunciation: impenetrable