EnglishMain Dictionary
impenetrable
Universal Words
adjective
1 that cannot be entered, passed through or seen through:
an impenetrable jungle / fortress * impenetrable darkness * The Japanese market used to be more or less impenetrable.
OPPPENETRABLE
2 ~ (to sb) impossible to understand:
an impenetrable mystery * Their jargon is impenetrable to an outsider. * Her expression was impenetrable.
impenetrability noun [U]
impenetrably adverb:
an impenetrably obscure writer
