HSK 7-9
不平
bùpíng形
uneven; injustice; unfairness; wrong
这条山路高低不平很难走。
Zhè tiáo shān lù gāo dī bù píng hěn nán zǒu.
This uneven mountain road is difficult to walk on.
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Appears across levels (7-9) in the HSK 3.0 word list.