adjective
1.
characterized by or given to willful and often unwise or irrational choices and demands
a proud fitful arbitrary nature
Synonyms: capricious, erratic, freakish, vagarious, wayward, whimsical, whimsied
Related Word: undisciplined, unruly, wild, willful; arrogant, unconstrained, unreasonable; careless, heedless, impetuous, indiscreet, precipitate, rash; kooky, screwball, zany
Contrasted words: circumspect, discreet, heedful, judicious, politic, reflective; calculating, discriminative, judicial, prudent, well-advised
2.
Synonyms: absolute 4, autarchic, autocratic, despotic, monocratic, tyrannical, tyrannous
Related Word: authoritarian, dictatorial, magisterial, oracular
Contrasted words: lawful, legal, licit, rightful
Antonyms: legitimate