漫不经心 Careless
Explanation
漫不经心指的是做事随便、不在意，不认真对待。
It means to do things casually, without care, and without taking them seriously.
Origin Story
从前，有个秀才叫李明，他天资聪颖，但学习却漫不经心。每次考试，他都只读几天书，然后就漫不经心地走进考场。结果可想而知，每次考试他都名落孙山。他的老师多次劝诫他，要认真学习，但李明总是不以为然。直到有一天，他参加县试，因为漫不经心，答题时出现了许多错误，最终落榜。这次打击让他深刻反思，他终于认识到漫不经心的危害，从此以后，他开始认真学习，最终金榜题名。
Once upon a time, there was a scholar named Li Ming, who was naturally intelligent, but careless in his studies. Every time he took an exam, he only read for a few days, then he walked into the examination hall carelessly. The result was predictable: he failed every exam. His teacher repeatedly advised him to study hard, but Li Ming didn't care. Until one day, when he participated in the county exam, because of his carelessness, he made many mistakes in answering questions, and finally failed. This blow made him reflect deeply, and he finally realized the harm of carelessness. From then on, he began to study hard, and finally succeeded in passing the imperial examination.
Usage
用于形容做事不认真，态度马虎。常用于批评人的行为。
Used to describe someone who is not serious in their work and has a careless attitude. Often used to criticize someone's behavior.
Examples
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他做事漫不经心，经常出错。
tā zuòshì màn bù jīng xīn, jīngcháng chūcuò
He is careless in his work and often makes mistakes.
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学习要专心致志，不能漫不经心。
xuéxí yào zhuānxīn zhìzhì, bù néng màn bù jīng xīn
You should concentrate on your studies and not be careless.
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面对如此重要的考试，他竟然漫不经心，真是令人担忧。
miàn duì rúcǐ zhòngyào de kǎoshì, tā jìngrán màn bù jīng xīn, zhēnshi lìng rén dānyōu
It's really worrying that he's so careless about such an important exam..