Correct

不识好歹

/ bù shí hǎodǎi / 
Strokes

Definition

unable to tell good from bad (idiom)/undiscriminating

Example

Definition

cannot tell good from bad; not know chalk from cheese; mistake good for bad

1
Tā
他
bùshíhǎodǎi
不识好歹
  
,
jìngrán
竟然
qù
去
qiǎngjié
抢劫
yī
一
gè
个
jǐngchá
警察
  
。

He made a misguided attempt to rob a policeman.

2
Tā
他
bùshíhǎodǎi
不识好歹
  
,
bǎ
把
wǒ
我
de
的
huà
话
dàngchéng
当成
èyì
恶意
le
了
  
。

He couldn't tell the difference between good and bad and took my words ill.