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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
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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for impregnability

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 impregnability
impregnable
1430, imprenable, from M.Fr. imprenable, from O.Fr. in- "not" + prenable "assailable, vulnerable," from stem of prendre "to take, grasp," from L. prehendere (see prehensile). With intrusive -g- 16c., on model of deign, reign, etc.
Online Etymology Dictionary, © 2010 Douglas Harper
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