大模大样 nonchalant
Explanation
形容态度傲慢，目中无人的样子。
describes an arrogant and supercilious attitude.
Origin Story
从前，有个年轻人名叫阿强，他自诩才华横溢，总是大模大样地对待周围的人。一天，他去参加一个重要的考试，因为过于自信，没有认真准备，结果考砸了。他很不服气，大模大样地去找主考官理论，结果被主考官狠狠地批评了一顿，让他明白了谦虚谨慎的重要性。从此以后，阿强改掉了大模大样的毛病，变得谦逊有礼了。
Once upon a time, there was a young man named Aqiang, who considered himself to be very talented and always treated others nonchalantly. One day, he went to take an important exam, but because he was too confident, he did not prepare seriously and failed the exam. He was very unconvinced and went to the examiner to argue, but the examiner criticized him severely, which made him understand the importance of humility and prudence. From then on, Aqiang changed his nonchalant attitude and became humble and polite.
Usage
通常用于形容人的态度和行为，多含贬义。
It is usually used to describe a person's attitude and behavior, mostly with a derogatory meaning.
Examples
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他大模大样地坐在那里，好像什么事也没发生。
ta da mo da yang de zuo zai nali,hao xiang shi me shi ye mei fa sheng.
He sat there nonchalantly, as if nothing had happened.
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他大模大样地走进办公室，一点也不拘谨。
ta da mo da yang de zou jin bangong shi, yi dian ye bu ju jin
He swaggered into the office without any restraint..