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;
The man's affection remains wholly unconcerned and impregnable. South.
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a. [ See Impregnate. ] (Biol.) Capable of being impregnated, as the egg of an animal, or the ovule of a plant. [ 1913 Webster ]