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4 definitions found
 for impregnable
From The Collaborative International Dictionary of English v.0.48 :

  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]

From The Collaborative International Dictionary of English v.0.48 :

  Impregnable \Im*preg"na*ble\, a. [See Impregnate.] (Biol.)
     Capable of being impregnated, as the egg of an animal, or the
     ovule of a plant.
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

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

From Moby Thesaurus II by Grady Ward, 1.0 :

  42 Moby Thesaurus words for "impregnable":
     deathless, defended, guarded, immortal, impenetrable, imperishable,
     incontestable, incorruptible, indelible, indestructible,
     indomitable, ineffaceable, ineradicable, inexpugnable,
     inextinguishable, insuperable, invincible, inviolable,
     invulnerable, irresistible, mighty, nonperishable, overpowering,
     overwhelming, protected, quenchless, resistless, safe, safeguarded,
     secure, shielded, unassailable, unbeatable, unconquerable,
     undampable, undefeatable, undestroyable, undying, unquenchable,
     unsubduable, unsurmountable, unyielding

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