I. (ˈ)im|pregnəbəl, əmˈp- adjective
Etymology: alteration (influenced by impregnate ) of earlier impreignable, alteration (influenced by such words as reign, deign, with silent g ) of earlier imprenable, from Middle English, from Middle French, from in- in- (I) + -prenable capable of being captured, from pren- (stem of prendre to take, capture, from Latin prehendere to grasp, seize) + -able — more at get
1. : incapable of being taken by assault : able to resist attack : unconquerable , unassailable
an impregnable fortress
impregnable virtue
also : incapable of being broken into or escaped from
an impregnable cell
2. : being beyond criticism or question : not subject to higher authority
an impregnable social position
of impregnable financial standing
an impregnable reputation for honesty
• im·pregnableness “+ noun -es
• im·pregnably “+ adverb
II. ə̇mˈpregnəbəl adjective
Etymology: impregn ate (II) + -able
: capable of being impregnated (as an egg)