unassailable

unassailable adj.

攻不破的

英英解釋:形容詞unassailable:
1. able to withstand attack
同義詞：impregnable, inviolable, secure, strong, unattackable
2. impossible to assail
同義詞：untouchable
3. without flaws or loopholes
同義詞：unshakable, watertight, bulletproof