arbitrary, fickle, unpredictable, cruel, irrational, impetuous, unreasonable, wrongheaded, illogical, vindictive, inexplicable, improvident, inflexible, heedless, inconstant, captious, unsympathetic, inscrutable, obstinate, overreaching, avaricious, pigheaded, unaccommodating, erratic, incompetent, impulsive, ambiguous, inconsistent, contumacious, doltish, flighty, brusk, misguided, perverse, impermanent, subjective, unforgiving, imprudent, dictatorial, nonrational, oppressive, venal, amoral, heartless, incomprehensible, tempestuous, unwise, unfriendly, unjust, foolhardy, unreasoned, byzantine, unpremeditated, haphazard, unsound, callous, meddlesome, untimely, untamable, quixotic, exasperating, reckless, insubordinate, untrustworthy, beggarly, obtuse, mercurial, unkind, blithe, cavalier, unknowable, idiosyncratic, manipulative, vengeful, maladroit, maladapted, peculiar, inefficacious, changeable, unlovable, unsystematic, tyrannical, shortsighted, ludic, highhanded, equable, irresolute, inept, benevolent, foolish, unaccountable, petulant, merciless, arrogant, uncaring, incorrigibly, unreflective, wanton, schoolmarmish, intemperate, unsporting, cloddish, wayward, irresponsible, despotic, freakish, headstrong, overbearing, revengeful, froward, inhuman, unsocial, willed, inconsiderate

capriciously, notion, whim, whimsey, whimsy

whimsical