impregnable in Russian
impregnable in Russian
непристу́пный
(military) Of a fortress or other fortified place: able to withstand all attacks; impenetrable, inconquerable, unvanquishable.
недосту́пный
(figuratively) Too strong to be defeated or overcome; invincible.
непристу́пный
(figuratively) Too strong to be defeated or overcome; invincible.
неуязви́мый
(figuratively) Too strong to be defeated or overcome; invincible.