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.

The man's affection remains wholly unconcerned and impregnable.

-- Im*preg"na*ble*ness, n. -- Im*preg"na*bly, adv.

Im*preg"na*ble (?), a. [See Impregnate.] (Biol.) Capable of being impregnated, as the egg of an animal, or the ovule of a plant.