HSK 7-9
苦笑
kǔxiào动
to force a smile; a bitter laugh
他听完后只能无奈苦笑。
Tā tīngwán hòu zhǐnéng wúnài kǔxiào.
After hearing it, he could only give a helpless, bitter smile.
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Appears across levels (7-9) in the HSK 3.0 word list.