Found 2 items, similar to impenetrableness.
English → English (WordNet) Definition: impenetrableness impenetrableness n : incomprehensibility by virtue of being too dense to understand [syn: impenetrability]
English → English (gcide) Definition: Impenetrableness Impenetrableness \Im*pen"e*tra*ble*ness\, n. The quality of being impenetrable; impenetrability. [1913 Webster]