Correct

磕巴

/ kē bā / 
Strokes

Example

As a Verb

stutter; stammer

1
Tā
他
yīxiàng
一向
yǒudiǎnr  
有点儿
kēbā
磕巴
  
。

He's always had a slight stammer.

2
Tā
他
shuōhuà
说话
kēkēbābā
磕磕巴巴
  
。

He stammers a lot.

As a Noun

stutterer; stammerer