See also: 自以为是

Chinese

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from; self; oneself
from; self; oneself; since
 
to mistakenly believe; to be under the impression; to have thought that
to mistakenly believe; to be under the impression; to have thought that; to assume
 
be; yes; this
trad. (自以為是/自以爲是) 以為/以爲
simp. (自以为是) 以为

Etymology

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From Xunzi (《荀子·榮辱》):

自以為是 [Classical Chinese, trad.]
自以为是 [Classical Chinese, simp.]
From: Xunzi, c. 3rd century BCE
Fán dòu zhě, bì zìyǐwèishì, ér yǐ rén wèi fēi yě. [Pinyin]
Those prone to fights invariably consider themselves right and others wrong.

Pronunciation

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Idiom

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自以為是

  1. to consider oneself in the right; to regard oneself as infallible; self-righteous