变化莫测 (biàn huà mò cè) — unpredictable, constantly changing; (idiom) capricious, volatile

Definition

Literally 'changes beyond measuring': emphasizes constant, rapid shifting in weather, markets, or moods. Closer to 'volatile' or 'fickle' than to plain 改变 (simple change).

idiom
unpredictableconstantly changingcapriciousvolatile

Examples

  • 变化莫测
    Zhè lǐ de tiān qì biàn huà mò cè, zǎo shàng hái qíng tiān, xià wǔ jiù xià yǔ le.
    The weather here is unpredictable — sunny in the morning, rainy in the afternoon.
  • 变化莫测
    Zuì jìn de gǔ shì biàn huà mò cè, shuí yě bù gǎn qīng yì tóu zī.
    The stock market has been so volatile lately that no one dares to invest casually.
  • 变化莫测
    Tā de qíng xù biàn huà mò cè, yí huì r gāo xìng, yí huì r shēng qì.
    His mood is fickle — happy one moment, angry the next.

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