"无敌" 的英语翻译是 "invincible"。这个词源于拉丁语，它的直译意思是 "不可征服的" 或 "不可战胜的"。

例句：

"The ancient Romans believed that their gods were invincible." (古罗马人相信他们的神是无敌的。)

"The team's confidence was high, but they soon found out that their opponents were invincible." (球队的信心很高，但他们很快发现对手是无敌的。)

"She had an invincible spirit that kept her going even in the darkest times." (她有一种无敌的精神，即使在最黑暗的时刻也能坚持下去。)