invulnerable
adj. 无懈可击的；不会受伤害的
例句
The submarine is invulnerable to attack while at sea.
潜艇在海上是不会受到攻击的。
《牛津词典》
Many daughters assume that their mothers are invulnerable.
许多女儿都臆想她们的母亲不会受到伤害。
《柯林斯英汉双解大词典》
He might have been called the invulnerable dwarf of the fray.
可以说，他是混战中的一个无懈可击的侏儒。
