[ im-preg-nuh-buhl ]
/ ɪmˈprɛg nə bəl /


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


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Origin of impregnable

1400–50; late Middle English impregnable, imprenable < Middle French, equivalent to im- im-2 + prenable pregnable

OTHER WORDS FROM impregnable

im·preg·na·bil·i·ty, im·preg·na·ble·ness, nounim·preg·na·bly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for impregnability

British Dictionary definitions for impregnability (1 of 2)

/ (ɪmˈprɛɡnəbəl) /


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

Derived forms of impregnable

impregnability 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

British Dictionary definitions for impregnability (2 of 2)


impregnatable (ˌɪmprɛɡˈneɪtəbəl)

/ (ɪmˈprɛɡnəbəl) /


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