impregnable

1 [im-preg-nuh-buhl]
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:
1400–50; late Middle English impregnable, imprenable < Middle French, equivalent to im- im-2 + prenable pregnable

impregnability, impregnableness, noun
impregnably, adverb


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


1. vulnerable.
Dictionary.com Unabridged

impregnable

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

Origin:
impregn(ate) + -able

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
impregnable1 (ɪmˈprɛɡnəbəl)
 
adj
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
 
[C15 imprenable, from Old French, from im- (not) + prenable able to be taken, from prendre to take]
 
impregna'bility1
 
n
 
im'pregnableness1
 
n
 
im'pregnably1
 
adv

impregnable or impregnatable2 (ɪmˈprɛɡnəbəl, ˌɪmprɛɡˈneɪtəbəl)
 
adj
able to be impregnated; fertile
 
impregnatable or impregnatable2
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

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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Example sentences
In its impregnable vaults it could house a whole battalion of infantry.
The city has a miasmic, sweetly offensive odor impregnable to the monsoon or to
  the daily industrial pollution.
The rebel mind had literally exhausted itself in its efforts to render the city
  impregnable.
In fact the forts on the surrounding hills looked impregnable when crowned with
  the frowning batteries.
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