capricious

adj

1. Impulsive and unpredictable; determined by chance, impulse, or whim.

   “I almost died in a capricious winter storm.”

   “Stringent rulers are unlikely to act capriciously.”

   “I am heere with thee, and thy Goats, as the moſt capricious Poet honeſt Ouid was among Gothes.”

   “"Capricious?" And at this monsieur began to laugh. "Oh no, I'm not capricious. I am very faithful. I am very constant. Comprenez?"”