impregnable

Adjective
Synonyms: inviolablesecurestrongunassailableunattackableconceptiveinexpugnable

WordNet 3.0

Adjective (3)

  1. immune to attack; incapable of being tampered with“an impregnable fortress”“fortifications that made the frontier inviolable”“a secure telephone connection”Synonyms: inviolablesecurestrongunassailableunattackable
  2. capable of conceivingSynonyms: conceptive
  3. incapable of being overcome, challenged or refuted“an impregnable argument”“impregnable self-confidence”Synonyms: inexpugnable
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Webster's Dictionary (GCIDE)

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]

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]
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