| Front | impenetrable |
|---|---|
| Back | BrE /ɪmˈpenɪtrəbl/NAmE /ɪmˈpenɪtrəbl/ adjective 1 that cannot be entered, passed through or seen throughan impenetrable jungle impenetrable darkness penetrable 2 impossible to understand incomprehensiblean impenetrable mystery Her expression was impenetrable.~ to sb Their jargon is impenetrable to an outsider.  im•pene•tra•bil•ity/BrE ɪmˌpenɪtrəˈbɪləti; NAmE ɪmˌpenɪtrəˈbɪləti/noun [uncountable]im•pene•trably/BrE ɪmˌpenɪtrəˈbli; NAmE ɪmˌpenɪtrəˈbli/ adverban impenetrably obscure writer |
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