"capricious" in the adjective sense
1. capricious, freakish
changeable
"a capricious summer breeze"
"freakish weather"
2. capricious, impulsive, whimsical
determined by chance or impulse or whim rather than by necessity or reason
"a capricious refusal"
"authoritarian rulers are frequently capricious"
"the victim of whimsical persecutions"
Source: WordNet® (An amazing lexical database of English)
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