吊儿郎当 careless
Explanation
形容态度不认真，作风散漫，仪表不整的样子。
describes a person who is careless, untidy, and lacking seriousness.
Origin Story
从前，有个年轻人叫小明，他做事总是吊儿郎当，不认真负责。有一次，师傅交给小明一个重要的任务，需要他仔细检查每一件零件。但小明却很随便，只是粗略地扫了一眼，就完事了。结果，因为小明的粗心大意，导致产品出现了严重的质量问题，给公司带来了巨大的损失。师傅批评了小明，让他明白了做事要认真负责的重要性。从此以后，小明改掉了吊儿郎当的坏习惯，认真对待每一件事，并最终成为了一名优秀的技工。
Once upon a time, there was a young man named Xiaoming who always did things carelessly and irresponsibly. Once, his master gave Xiaoming an important task that required him to carefully inspect each part. But Xiaoming was very casual and just glanced at it roughly before finishing. As a result, due to Xiaoming's carelessness, serious quality problems occurred, causing huge losses to the company. The master criticized Xiaoming and made him understand the importance of being serious and responsible. From then on, Xiaoming changed his careless habits, treated every matter seriously, and eventually became an excellent technician.
Usage
用于形容人做事不认真，态度散漫。多用于口语。
Used to describe someone who is not serious about their work and has a careless attitude. Mostly used in colloquial language.
Examples
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他做事吊儿郎当的，一点也不认真。
tā zuòshì diào er láng dāng de, yīdiǎn yě bù rènzhēn。
He does things carelessly and is not serious at all.
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不要吊儿郎当地对待学习，要认真负责。
bùyào diào er láng dāng de duìdài xuéxí, yào rènzhēn fùzé。
Don't be careless about your studies; be serious and responsible.
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他总是吊儿郎当地穿着衣服，一点也不讲究。
tā zǒngshì diào er láng dāng de chuān zhe yīfu, yīdiǎn yě bù jiǎngjiu。
He always dresses carelessly and is not particular about his appearance at all.