HSK 7-9
不以为然
bùyǐwéiránnot to accept as correct (idiom); to object; to disapprove; to take exception to
他对这种解释很不以为然。
Tā duì zhè zhǒng jiě shì hěn bù yǐ wéi rán.
He strongly disagrees with this explanation.
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Appears across levels (7-9) in the HSK 3.0 word list.