adj.

1. Impossible to capture or enter by force: an impregnable fortress.
2. Difficult or impossible to attack, challenge, or refute with success: an impregnable argument.

[Middle English imprenable, from Old French : in-, not (from Latin in-; see in–¹) + prenable, pregnauble, pregnable; see pregnable.]

impregnably im·preg'na·bly adv.
im·preg·na·ble² (ĭm-prĕg'nə-bəl)
adj.

Capable of being impregnated.

[IMPREGN(ATE) + –ABLE.]

adjective

Incapable of being conquered, overrun, or subjugated: indomitable, invincible, unconquerable. See do/not do, win/lose/recovery.

adj. 1. (of a fortified position) unable to be captured or broken into: an impregnable wall of solid sandstone.

2. unable to be defeated or destroyed; unassailable: the guerrillas found the citadel impregnable.

impregnability n. impregnably adv.

See the Introduction, Abbreviations and Pronunciation for further details.

IN BRIEF: Unconquerable, unable to be taken by assault.

True courage is a result of reasoning. A brave mind is always impregnable. — Jeremy Collier.

Dansk (Danish)
1.
adj. - uindtagelig, uangribelig, uovervindelig, ufravigelig, ubestridelig

2.
adj. - befrugtet

Nederlands (Dutch)
onneembaar

Français (French)
1.
adj. - imprenable

2.
adj. - fécondé (un ¯uf)

Deutsch (German)
1.
adj. - uneinnehmbar, einbruchsicher, unerschütterlich

2.
adj. - befruchtbar (Ei)

Ελληνική (Greek)
adj. - απόρθητος, δυσάλωτος

Italiano (Italian)
inespugnabile

Português (Portuguese)
adj. - impregnável, inexpugnável

Русский (Russian)
неприступный, непоколебимый

Español (Spanish)
1.
adj. - inexpugnable, invulnerable

2.
adj. - fecundable

Svenska (Swedish)
adj. - ointaglig, oövervinnelig, obestridlig, orubblig

中文（简体） (Chinese (Simplified))
1. 可以受孕的, 可以受精的

2. 无法攻取的, 难攻陷的, 要塞坚固的

中文（繁體） (Chinese (Traditional))
1.
adj. - 可以受孕的, 可以受精的

2.
adj. - 無法攻取的, 難攻陷的, 要塞堅固的

한국어 (Korean)
1.
adj. - 난공 불락의, 확고 부동한

2.
adj. - 수정 가능한

日本語 (Japanese)
adj. - 攻略できない, 難攻不落の, 堅固な

العربيه (Arabic)
‏(صفه) منيع, حصين‏

עברית (Hebrew)
adj. - ‮שאין לכבשו, איתן, מוצק, שאין לערערו‬
adj. - ‮בלתי-חדיר‬

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