HSK 7-9
起劲
qǐjìn形
energetic; vigorous; enthusiastic
孩子们在操场上玩得很起劲。
Háizi men zài cāochǎngshàng wánde hěn qǐjìn.
The children played energetically on the playground.
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Appears across levels (7-9) in the HSK 3.0 word list.