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impregnable1

[im-preg-nuh-buh l] /ɪmˈprɛg nə bəl/
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 impregnable1
late Middle English
1400-1450
1400-50; late Middle English impregnable, imprenable < Middle French, equivalent to im- im-2 + prenable pregnable
Related forms
impregnability, impregnableness, noun
impregnably, adverb
Synonyms
1. invulnerable. 1, 2. See invincible. 2. unassailable.
Antonyms
1. vulnerable.

impregnable2

[im-preg-nuh-buh l] /ɪmˈprɛg nə bəl/
adjective
1.
susceptible to impregnation, as an egg.
Origin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for impregnable
Contemporary Examples
Historical Examples
  • It is easy, therefore, to understand why the early Jebusites regarded their city as impregnable.

    Biblical Geography and History Charles Foster Kent
  • In our own single manhood to be bold, Fortressed in conscience and impregnable.'

    The Grand Old Man Richard B. Cook
  • Resistance was cut short and Al-Qamus, the impregnable, was captured by the warriors of Islam.

    The Life of Mohammad Etienne Dinet
  • Slowly, cautiously, it was unrolling its ball of impregnable armour.

    White Fang Jack London
  • His position was impregnable to the dogs, but, thus perched, he was a splendid mark for E-tuk-i-shook.

    My Attainment of the Pole Frederick A. Cook
  • The Republic could not suffer at their hands; the Republic and the dynasty were impregnable.

    The Adventurer Cyril M. Kornbluth
British Dictionary definitions for impregnable

impregnable1

/ɪmˈprɛɡnəbəl/
adjective
1.
unable to be broken into or taken by force: an impregnable castle
2.
unable to be shaken or overcome: impregnable self-confidence
3.
incapable of being refuted: an impregnable argument
Derived Forms
impregnability, impregnableness, noun
impregnably, adverb
Word Origin
C15 imprenable, from Old French, from im- (not) + prenable able to be taken, from prendre to take

impregnable2

/ɪmˈprɛɡnəbəl/
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
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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
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