im·preg·na·ble /ɪmˈprɛgnəbəl/
 (a.)無法攻取的,要塞堅固的,難攻陷的,堅定的


 Im·preg·na·ble a.  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 a.  Biol. Capable of being impregnated, as the egg of an animal, or the ovule of a plant.

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 impregnable
      adj 1: able to withstand attack; "an impregnable fortress";
             "fortifications that made the frontier inviolable"
             [syn: inviolable, secure, strong, unassailable,
              unattackable]
      2: impossible to take by storm [syn: inexpugnable]