ca·pri·cious /kə-'pri-shəs, -'prē-/ adj
1: governed or characterized by impulse or whim: as
a: lacking a rational basis
b: likely to change suddenly
2: not supported by the weight of evidence or established rules of law
— often used in the phrase arbitrary and capricious
ca·pri·cious·ly adv
ca·pri·cious·ness n
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.