capricious
kuh-PRISH-uhs/kəˈpɹɪʃəs/
- 1Likely to change suddenly because of a mood or chance, so it is hard to predict.
The weather in the mountains is capricious, so bring a jacket.
Her boss was capricious and changed the rules every week.
Similarfickle, whimsical, arbitrary, flighty, wayward
Oppositesteady, consistent, predictable, reliable
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Origin
From French, from the Italian word capriccio.