HSK 7-9
乖
guāi形
(of a child) obedient, well-behaved; clever; shrewd; alert
这孩子很乖从不乱跑。
Zhè hái zi hěn guāi cóng bú luàn pǎo.
This child is well behaved and never runs off.
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Appears across levels (7-9) in the HSK 3.0 word list.