1. strong enough to resist or withstand attack; not to be taken by force, unconquerable: an impregnable fort.
  2. not to be overcome or overthrown: an impregnable argument.


  1. unable to be broken into or taken by forcean impregnable castle
  2. unable to be shaken or overcomeimpregnable self-confidence
  3. incapable of being refutedan impregnable argument


  1. able to be impregnated; fertile

early 15c., imprenable “impossible to capture,” from Middle French imprenable “invulnerable,” from assimilated form of in- “not, opposite of” (see in- (1)) + Old French prenable “assailable, vulnerable” (see pregnable). With intrusive -g- 16c., on model of deign, reign, etc. Related: Impregnability.

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