Correct

不是闹着玩的

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Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/不是闹着玩的-Chinese-idioms-Cchatty-a8ca861e-908b-4df7-bac5-17181d910fc9-1612776238.jpg

Collocation

1
决不是闹着玩的
2
这可不是闹着玩的

Definition

不是闹着玩的:

Literally means:

it is no joke

Actually means:

It means something is not a minor thing and should not be dealt with casually. It is often used to remind people to treat something seriously and carefully.

不是随随便便的事。表示不能轻视的事。指事情是严重的,要严肃地对待。一般用于提醒别人应认真对待某事。

Example

Used as predicate. (作谓语)
1
Zài
shùlín
树林
yóuwán
游玩
de
shíhou
时候
qiānwàn
千万
yào
不要
diǎnhuǒ
点火
  
,
shùlín
树林
zháohuǒ
着火
le
bushì
不是
nàozhāowán
闹着玩
de
  
,
suǒ
所以
dìng
一定
yào
xiǎoxīn
小心
  

Don't light a fire when you're playing in the woods, it's not a fun thing to do when the woods catch fire, so be careful.

2
Bèi
gǒu
yǎo
le
bushì
不是
nàozhāowán
闹着玩
de
  
,
wàn
万一
le
得了
kuángquǎnbìng
狂犬病
huì
yǒu
shēngmìng
生命
wēixiǎn
危险
  

Being bitten by a dog is not a game, in case you get rabies, your life will be in danger.

3
Zài
chūguó
出国
zhōng
途中
diū
le
zhào
护照
jué
决不
shì
nàozhāowán
闹着玩
de
  
,
lòng
hǎo
不好
lián
huíguó
回国
dōu
néng
可能
chéngwèn
成问题
  
,
suǒ
所以
yào
xiǎoxīn
小心
bǎoguǎn
保管
hǎo
  

Losing your passport on the way abroad is by no means a hass matter, not even returning home can be a problem, so be careful to keep it.