capricious
kuh-PRISH-uhs/kəˈpɹɪʃəs/
- 1Changing suddenly and unpredictably on impulse; decided by chance, impulse, or whim.
Sailors learned to respect the capricious winds along that stretch of coast.
Critics accused the board of making capricious decisions about who would be promoted.
Similarfickle, whimsical, arbitrary, flighty, wayward
Oppositesteady, consistent, predictable, reliable
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Origin
Borrowed from Middle French capricieux, from Italian capriccioso, from capriccio. It can also be analysed as caprice + -ious.