"undefeated" in Chinese (Simplified)
不败
Definition
在比赛、竞赛或战斗中没有输过；从未被击败过。
Usage Notes (Chinese (Simplified))
通常用于体育或比赛，指从未输过的个人或团队。正式、积极，有时也比喻坚持到底的人。不要和“不可战胜”（invincible）混淆。
Examples
The team remained undefeated all season.
这个队整个赛季都**不败**。
He is still undefeated after ten matches.
他十场比赛后仍然**不败**。
The champion retired undefeated.
冠军**不败**退役。
They fought hard to keep their undefeated record.
他们拼尽全力保持**不败**纪录。
Even after her injury, she stayed undefeated.
即使受伤后，她依然**不败**。
His spirit was always undefeated, no matter what happened.
无论发生什么，他的精神始终**不败**。