impenetrable
im|pen|etrable /ɪmp'enɪtrəbəl/
1 [ADJ] usu ADJ n
If you describe something such as a barrier or a forest as impenetrable, you mean that it is impossible or very difficult to get through.
...the Caucasus range, an almost impenetrable barrier between Europe and Asia.
2 [ADJ]
If you describe something such as a book or a theory as impenetrable, you are emphasizing that it is impossible or very difficult to understand.
His books are notoriously impenetrable.
= incomprehensible
● impenetrably [ADV] ADV adj
...impenetrably detailed reports on product sales.
= incomprehensibly
1 [ADJ] usu ADJ n
If you describe something such as a barrier or a forest as impenetrable, you mean that it is impossible or very difficult to get through.
...the Caucasus range, an almost impenetrable barrier between Europe and Asia.
2 [ADJ]
If you describe something such as a book or a theory as impenetrable, you are emphasizing that it is impossible or very difficult to understand.
His books are notoriously impenetrable.
= incomprehensible
● impenetrably [ADV] ADV adj
...impenetrably detailed reports on product sales.
= incomprehensibly