自负 (zì fù): 誇大

As soon as he joined the company, he conceitedly believed he was the most capable person, but ended up making a big mistake in his first project.

Because she was conceited, she never listened to her teammates' advice, so after they lost the match, no one wanted to work with her again.

His conceited attitude made the interviewer feel he would be hard to integrate into the team, so even though his resume was excellent, he was ultimately not hired.

When he was young, he was extremely conceited and thought he knew everything, until he met a true expert at work and realized there was still a lot he needed to learn.

Her conceit made her always show off her achievements in front of friends, and over time, her friends gradually drifted away from her.