变幻莫测 biànhuàn-mòcè to change unpredictably
to change unpredictably; unpredictable; erratic; treacherous
How to remember 变幻莫测: 变 change + 幻 illusion + 莫 cannot + 测 to survey = to change unpredictably.
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How it is used
- An idiom: 'changing unpredictably / ever-shifting and impossible to gauge' - 局势变幻莫测 (the situation is volatile and unpredictable), 变幻莫测的天气.
- Describes something so mutable you can't foresee its next turn; used for weather, situations, moods, and fortunes.