Correct

不败

/ bù bài / 
Strokes

Definition

undefeated

Example

As an Adjective

unbeaten; undefeated

1
Yǐ
以
bù
不
bài
败
de
的
zhànjì
战绩
jìnrù
进入
xià
下
yī
一
lún
轮

enter the next round undefeated

2
Bǎochí
保持
bù
不
bài
败
de
的
jìlù
记录

hold an unbeaten/invincible record