impregnable

1
[ im-preg-nuh-buhl ]
/ ɪmˈprɛg nə bəl /

adjective

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.

Origin of impregnable

1
1400–50; late Middle English impregnable, imprenable < Middle French, equivalent to im- im-2 + prenable pregnable

Related forms

im·preg·na·bil·i·ty, im·preg·na·ble·ness, nounim·preg·na·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for impregnability

British Dictionary definitions for impregnability (1 of 2)

impregnable

1
/ (ɪmˈprɛɡnəbəl) /

adjective

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

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)

impregnable

2

impregnatable (ˌɪmprɛɡˈneɪtəbəl)

/ (ɪmˈprɛɡnəbəl) /

adjective

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