adj.武断的，任性的；adj.随意的,
Merriam-Webster Online Dictionary
arbitrary (adjective)1.
depending on individual (as of a judge) and not fixed by law - discretion the manner of punishment is arbitrary
2.
a) not restrained or limited in the exercise of power ruling by absolute authority - an arbitrary government
b) marked by or resulting from the unrestrained and often exercise of power - tyrannical protection from arbitrary arrest and detention
3.
a) based on or determined by individual preference or convenience rather than by necessity or the nature of something - intrinsic an arbitrary standard take any arbitrary positive number arbitrary division of historical studies into watertight compartments A. J. Toynbee
b) existing or coming about seemingly at random or by chance or as a capricious and act of will - unreasonable when a task is not seen in a meaningful context it is experienced as being arbitrary Nehemiah Jordan
Merriam-Webster Online Thesaurus
arbitrary (adjective)1.
having or showing a tendency to force one's will on others without any regard to fairness or necessity
SYNONYMS:
dictatorial, high-handed, imperious, peremptory, willful ( wilful)RELATED WORDS:
arrogant, commanding, demanding, dominant, domineering, haughty, imperative, lordly, masterful, overbearing, presumptuous; authoritarian, autocratic ( autocratical), despotic, totalitarian, tyrannical ( tyrannic), tyrannous; capricious, changeable, erratic, inconsistent, mercurial, whimsical; biased, inequitable, partisan, prejudiced, unequal, unfair, unjust, unrealistic, unreasonable; unconscionable, unethical, unprincipled, unscrupulousNEAR ANTONYMS:
balanced, disinterested, dispassionate, equal, equitable, evenhanded, fair, impartial, just, nonpartisan, objective; rational, reasonable, understanding; unbiased, unprejudiced; ethical, honorable, irreproachable, law-abiding, moral, principled, unimpeachable2.
lacking a definite plan, purpose, or pattern
SYNONYMS:
aimless, arbitrary, catch-as-catch-can, desultory, erratic, haphazard, helter-skelter, hit-or-miss, scattered, slapdash, strayRELATED WORDS:
accidental, casual, chance, chancy, contingent, fluky ( flukey), fortuitous, inadvertent, incidental, lucky, unconsidered, unintended, unintentional, unplanned, unpremeditated; scattershot, shotgun; irregular, odd, sporadic, spot; directionless, objectless, purposeless; indiscriminate, unsystematic; undirected; disorderly, disorganized; undiscriminating, unselectiveNEAR ANTONYMS:
established, fixed, regular, set, stable, steady; constant, continuous, even; arranged, managed, orchestrated, ordered, planned; aware, conscious, deliberate, purposeful, thoughtful, willful ( wilful)3.
exercising power or authority without interference by others
SYNONYMS:
arbitrary, autocratic ( autocratical), czarist ( tsarist tzarist), despotic, dictatorial, monocratic, tyrannical ( tyrannic), tyrannousRELATED WORDS:
authoritarian, jackbooted, oppressive, totalitarian; antidemocratic, antirepublican; high-handed, magisterial; domineering, imperious, masterful; all-powerful, almighty, omnipotent; autonomous, self-governing, self-ruling, sovereign ( sovran); unconditional, unlimitedNEAR ANTONYMS:
circumscribed, restrained, restricted; constitutional, lawful; democratic, republican