自以为是 zìyǐwéishì to believe oneself infallible (idiom)
to believe oneself infallible (idiom); to be opinionated
How to remember 自以为是: 自 self + 以 to use + 为 for + 是 is = to believe oneself infallible (idiom).
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How it is used
- Idiom: to think oneself always right - opinionated and self-righteous - 他太自以为是，听不进别人的意见 (tā tài zìyǐwéishì, tīng bú jìn biérén de yìjiàn) he's so full of himself he won't take advice.
- Pointedly critical: assumes one's own view is correct and dismisses others.
- Common personality criticism; the opposite of 虚心 (open-minded) - 虚心学习 (xūxīn xuéxí) learn with an open mind.