"Invincible" is the Engpsh word for "无敌".

For example, you could say "He is an invincible boxer" to mean "他是一个无敌的拳击手".

Note that "invincible" means that someone or something is unbeatable or unable to be defeated. It is often used in a metaphorical sense to describe someone who is very skilled or confident in a particular area or activity.