Correct

不哼不哈

/ bù hēng bù hā / 
Strokes

Example

Definition

keep/remain silent about sth (when one shouldn't)

1
Yǒu
有
shìqíng
事情
wèn
问
tā
他
shí
时
  
,
tā
他
zǒngshì
总是
bù
不
hēng
哼
bù
不
hā
哈
  
,
zhēn
真
jí
急
rén
人
  
。

It is really annoying that he is never forthcoming with any ideas when he is consulted.

2
Tā
他
píngshí
平时
yìjiàn
意见
tǐng
挺
duō
多
de
的
  
,
jīnr  
今儿
ge
个
zěnme
怎么
bù
不
hēng
哼
bù
不
hā
哈
le
了
  
?

He has often complained about things, but why is he silent today?