Capricious is an adjective to describe a person or thing that's impulsive and unpredictable, like a bride who suddenly leaves her groom standing at the wedding altar.

You can criticize a fickle-minded person as capricious, but it could just as well describe quickly changing weather, as in "capricious spring storms." It's the adjective form of the noun caprice, which means a sudden change of mood. Caprice might come from capra, the Italian word for "goat" (because goats are frisky), or from capo, "head" + riccio, "hedgehog." Why bring hedgehogs into it? If you have a "hedgehog head," you are so scared that your hair is standing straight on end. A scared person makes sudden starts this way and that, just as a capricious person does.

Definitions of capricious

adj determined by chance or impulse or whim rather than by necessity or reason

“a capricious refusal”
“authoritarian rulers are frequently capricious
impulsive, whimsical
based on or subject to individual discretion or preference or sometimes impulse or caprice

adj changeable

“a capricious summer breeze”
not capable of being foretold

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