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Dictionary Language resources

impenetrable

Pronunciation: /ɪmˈpɛnɪtrəb(ə)l/

Translate impenetrable | into French | into German | into Italian | into Spanish

Definition of impenetrable

adjective

impossible to pass through or enter:a dark, impenetrable forest
impossible to understand:her expression was impenetrable impenetrable jargon
Physics (of matter) incapable of occupying the same space as other matter at the same time.

Derivatives

impenetrability
impenetrably

Origin:

late Middle English: via French from Latin impenetrabilis, from in- 'not' + penetrabilis 'able to be pierced', from the verb penetrare (see penetrate)