impregnable Meaning, Definition & Usage

  1. adjective satellite immune to attack; incapable of being tampered with
    unattackable; secure; unassailable; inviolable; strong.
    • an impregnable fortress
    • fortifications that made the frontier inviolable
    • a secure telephone connection
  2. adjective satellite capable of conceiving
    conceptive.
  3. adjective satellite incapable of being overcome, challenged or refuted
    inexpugnable.
    • an impregnable argument
    • impregnable self-confidence

WordNet

Im*preg"na*ble adjective
Etymology
F. imprenable; pref. im- not + prenable pregnable, fr. prendre to take, L. prehendere. See Comprehend, Get to obtain.
Definitions
  1. 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. South.
    -- Im*preg"na*ble*ness, n. -- Im*preg"na*bly, adv.
Im*preg"na*ble adjective
Etymology
See Impregnate.
Definitions
  1. (Biol.) Capable of being impregnated, as the egg of an animal, or the ovule of a plant.

Webster 1913