impregnable in Japanese
impregnable in Japanese
鉄壁
(military) Of a fortress or other fortified place: able to withstand all attacks; impenetrable, inconquerable, unvanquishable.
鐵壁
(military) Of a fortress or other fortified place: able to withstand all attacks; impenetrable, inconquerable, unvanquishable.
受精可能な
Capable of being impregnated; impregnatable.
受胎可能な
Capable of being impregnated; impregnatable.
難攻不落の
(figuratively) Too strong to be defeated or overcome; invincible.