impregnable

1
[im-preg-nuh-buhl]
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adjective
  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.

Origin of impregnable

1
1400–50; late Middle English impregnable, imprenable < Middle French, equivalent to im- im-2 + prenable pregnable
Related formsim·preg·na·bil·i·ty, im·preg·na·ble·ness, nounim·preg·na·bly, adverb

Synonyms for impregnable

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1. invulnerable. 1, 2. See invincible. 2. unassailable.

Antonyms for impregnable

impregnable

2
[im-preg-nuh-buh l]
adjective
  1. susceptible to impregnation, as an egg.

Origin of impregnable

2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018


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British Dictionary definitions for impregnable

impregnable

1
adjective
  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
Derived Formsimpregnability or impregnableness, nounimpregnably, adverb

Word Origin for impregnable

C15 imprenable, from Old French, from im- (not) + prenable able to be taken, from prendre to take

impregnable

2

impregnatable (ˌɪmprɛɡˈneɪtəbəl)

adjective
  1. able to be impregnated; fertile
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for impregnable
adj.

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.

Online Etymology Dictionary, © 2010 Douglas Harper