HSK 7-9
诚恳
chéngkěn形
sincere; honest; cordial
他的道歉态度十分诚恳。
Tā de dào qiàn tài dù shí fēn chéng kěn.
His apology was very sincere.
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Appears across levels (7-9) in the HSK 3.0 word list.