Correct

假正经

/ jiǎ zhèng jīng / 
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/假正经-Chinese-idioms-Cchatty-6d7e4f9c-9d06-46fd-804a-856fc3b32412-1612776423.jpg

Collocation

1
何必假正经
2
别假正经
3
某人是十足的假正经

Definition

假正经

Literally means:

to pretend to be honest or rious

Actually means:

It means pretending to be strictly upright or serious. Derogatory.

假装成很规矩,很正派的样子。具有贬义色彩。

Example

Used as predicate or object. (作谓语、宾语)
1
Biè
别
kàn
看
tā
他
zài
在
lǎopó
老婆
miànqián
面前
bù
不
hējiǔ
喝酒
  
,
qíshí
其实
shì
是
shízú
十足
de
的
jiǎ
假
zhèngjīng
正经
  
。
Nǐ
你
kàn
看
  
,
jīntiān
今天
shàngwǔ
上午
tā
他
lǎopó
老婆
gāng
刚
chūchāi
出差
  
,
xiàwǔ
下午
tā
他
jiù
就
dào
到
jiǔbā
酒吧
qù
去
guǐhùn
鬼混
le
了
  
。

Don't look at him not drinking in front of his wife. You see, his wife just went on a business trip this morning, and he went to the bar in the afternoon.

2
Shuí
谁
bù
不
zhīdào
知道
nǐ
你
shì
是
jiǎ
假
zhèngjīng
正经
  
,
biè
别
zài
在
wǒ
我
miànqián
面前
zhuāng
装
lǎoshirén
老实人
le
了
  
。

Who doesn't know you're a fake, don't pretend to be honest in front of me.

3
Rénshēngzàishì
人生在世
  
,
zhīqiú
只求
wúkuìyúxīn
无愧于心
  
。
Jìrán
既然
bú
不
shi
是
shénme
什么
shèngrén
圣人
  
,
hébì
何必
jiǎ
假
zhèngjīng
正经
  
。

Life is alive, just be worthy of your heart. Since it's not a saint, why fake it?