自以為是

Simplified: 自以为是

On the HSK 7-9 vocabulary list, at CEFR level C1.

zìyǐwéishì ㄗˋ ㄧˇ ㄨㄟˊ ㄕˋ

    • to believe oneself infallible (idiom)
    • to be opinionated

Character by character

Sources