Found 2 items, similar to impregnable.
English → English (WordNet) Definition: impregnable impregnable adj 1: able to withstand attack; “an impregnable fortress”; “fortifications that made the frontier inviolable” [syn: inviolable, secure, strong, unassailable, unattackable] 2: impossible to take by storm [syn: inexpugnable]
English → English (gcide) Definition: Impregnable Impregnable \Im*preg"na*ble\, a. [F. imprenable; pref. im- not + prenable pregnable, fr. prendre to take, L. prehendere. See Comprehend, Get to obtain.] Not to be stormed, or taken by assault; incapable of being subdued; able to resist attack; unconquerable; as, an impregnable fortress; impregnable virtue. [1913 Webster] The man's affection remains wholly unconcerned and impregnable. --South. -- Im*preg"na*ble*ness, n. -- Im*preg"na*bly, adv. [1913 Webster] Impregnable \Im*preg"na*ble\, a. [See Impregnate.] (Biol.) Capable of being impregnated, as the egg of an animal, or the ovule of a plant. [1913 Webster]