自负 (zì fù): To be responsible for (Adj.) — Meaning & Stroke Order

He became very conceited because of his past successes.

Don't you think his recent behavior has been a bit too arrogant?

Although he is exceptionally talented, he is not at all conceited and always seeks advice humbly.

Don't be so conceited; listening more to your colleagues' opinions won't do you any harm.