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

SYNONYMS FOR impregnable

1, 2 See invincible.
2 unassailable.

OTHER WORDS FROM impregnable

im·preg·na·bil·i·ty, im·preg·na·ble·ness, noun im·preg·na·bly, adverb

Definition for impregnable (2 of 2)

impregnable 2
[ im-preg-nuh-buh l ]
/ ɪmˈprɛg nə bəl /

adjective

susceptible to impregnation, as an egg.

Origin of impregnable

2

Example sentences from the Web for impregnable

British Dictionary definitions for impregnable (1 of 2)

impregnable 1
/ (ɪmˈprɛɡnəbəl) /

adjective

unable to be broken into or taken by force an impregnable castle
unable to be shaken or overcome impregnable self-confidence
incapable of being refuted an impregnable argument

Derived forms of impregnable

impregnability or impregnableness, noun impregnably, 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 impregnable (2 of 2)

impregnable 2

impregnatable (ˌɪmprɛɡˈneɪtəbəl)

/ (ɪmˈprɛɡnəbəl) /

adjective

able to be impregnated; fertile