capricious

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
1

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

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

adj changeable

“a capricious summer breeze”
Synonyms:
freakish
unpredictable
not capable of being foretold

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