'Impregnably' definitions:

Definition of 'impregnably'

(from WordNet)
adverb
In an impregnable manner; "the sight of that bland, impregnably righteous face has been enough to make their blood run cold"

Definition of 'Impregnably'

From: GCIDE
  • 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]