捉摸不定 unpredictable
Explanation
形容变化无常，难以捉摸，无法猜测或预料。
Describes something as unpredictable, elusive, and impossible to guess or predict.
Origin Story
从前，有个老渔夫，他出海捕鱼几十年，对海洋的脾气了如指掌。可是有一天，海面风平浪静，阳光明媚，却突然起了风暴，惊涛骇浪，船只被卷入其中，老渔夫拼尽全力也无法控制，他不得不感慨，大自然的力量真是捉摸不定，让人防不胜防。 另一个故事里，一位算命先生，他声称能够预测未来，许多人慕名而来。他仔细观察每个人的面相、手相，并结合易经八卦进行推演，然而，他的预言时而准确，时而落空，让人捉摸不定，最后人们发现，他的预言其实只是巧合的叠加。
Once upon a time, there was an old fisherman who had been fishing at sea for decades and knew the temper of the ocean like the back of his hand. But one day, the sea was calm and the sun was shining, yet a sudden storm arose, with huge waves and the boat was caught in it. The old fisherman tried his best but could not control it, he had to sigh, the power of nature is really unpredictable, and people are caught off guard. In another story, a fortune teller claimed to be able to predict the future, and many people came to see him. He carefully observed everyone's face and hand, and combined the I Ching and Bagua to make predictions. However, his predictions were sometimes accurate and sometimes wrong, making them unpredictable. In the end, people discovered that his predictions were merely coincidental overlaps.
Usage
作谓语、定语；形容难以捉摸，变化无常。
Used as a predicate or attributive; describes something as unpredictable and capricious.
Examples
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他的心思总是捉摸不定，让人难以理解。
tā de xīnsī zǒngshì zhuō mō bù dìng, ràng rén nán yǐ lǐjiě
His mind is always unpredictable, making him hard to understand.
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股市行情捉摸不定，风险很大。
gǔshì xíngqíng zhuō mō bù dìng, fēngxiǎn hěn dà
The stock market is unpredictable and very risky.
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天气变化捉摸不定，难以预测。
tiānqì biànhuà zhuō mō bù dìng, nán yǐ yùcè
The weather is unpredictable and difficult to predict.