Correct

愣头青

/ lèng tóu qīng /
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/愣头青-Chinese-idioms-Cchatty-4ab77ac3-9d7e-4bec-814f-25c7bfe5d738-1612777095.jpg

Collocation

1
不懂世事的愣头青
2
是个愣头青

Definition

愣头青

Literally means:

a rash fellow

Actually means:

It metaphorically refers to a reckless person. Derogatory.

容做事鲁莽冒失的人。具有贬义色彩。

Example

Used as object, attributive or subject (作宾语、定语、主语)
1
zěnme
怎么
zhème
这么
zhòngyào
重要
de
shìqing
事情
jiāogěi
交给
le
  
?
Shuí
zhīdào
知道
shì
lèngtóuqīng
愣头青
  

How did you give him such an important thing? Who doesn't know he's a snr.

2
rènshi
认识
shí
  
,
háishi
还是
lèngtóuqīng
愣头青
shìde
似的
xiǎoháizi
小孩子
  
,
xiànzài
现在
què
hái
gāo
le

When I met him, he was still a young child, but now he is taller than me

3
Hāi
  
,
zhège
这个
dǒngshì
懂事
de
lèngtóuqīng
愣头青
  
,
第一
dào
péngyou
女朋友
jiā
家里
  
,
jìngrán
竟然
liǎngshǒukōngkōng
两手空空
shénme
什么
礼物
méi
dài
  

Hey, this insophemable tsinge, the first time to his girlfriend's house, even empty-handed no gifts with.