Word: 自以为是 (zìyǐwéishì) Traditional: 自以為是 自以为是 dictionary entry zìyǐwéishì to believe oneself infallible (idiom); to be opinionated Full dictionary entry for 自以为是 Example sentences using 自以为是 2 sentences, showing page 1 of 1. 他自以为是。 Tā zìyǐwéishì. He believes himself to be infallible. 自以为是的人很难进步。 Zìyǐwéishì de rén hěn nán jìnbù. People who are full of themselves find it hard to improve.