that cannot be harmed or defeated 不會受傷害的;打不敗的;安全的 to be in an invulnerable position 立於不敗之地 Parents may seem invulnerable to their children. 父母似乎對他們的孩子無懈可擊。 - invulnerable to something
The submarine is invulnerable to attack while at sea. 潛艇在海上是不會受到攻擊的。
Word Originlate 16th cent. (earlier than vulnerable): from Latin invulnerabilis, from in- ‘not’ + vulnerabilis (from vulnerare ‘to wound’, from vulnus ‘wound’).