HSK 7-9
变幻莫测
biànhuàn-mòcèto change unpredictably; unpredictable; erratic; treacherous
山里的天气总是变幻莫测。
Shān lǐ de tiān qì zǒng shì biàn huàn mò cè.
The weather in the mountains is always unpredictable.
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Appears across levels (7-9) in the HSK 3.0 word list.