Found 2 items, similar to impregnability.
English → English (WordNet) Definition: impregnability impregnability n : having the strength to withstand attack [syn: invulnerability]
English → English (gcide) Definition: Impregnability Impregnability \Im*preg`na*bil"i*ty\, n. The quality or state of being impregnable; invincibility. [1913 Webster]