HSK 7-9
残酷
cánkù形
cruel; harsh; merciless
战争的残酷让人无法忘记。
Zhàn zhēng de cán kù ràng rén wú fǎ wàng jì.
The cruelty of war is impossible to forget.
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Appears across levels (7-9) in the HSK 3.0 word list.