Based on or subject to individual discretion or preference or sometimes impulse or caprice.

Roget 739: severe; strict, hard, harsh, dour, rigid, stiff, stern, rigorous, uncompromising, exacting, exigent, exigeant^†, inexorable, inflexible, obdurate, austere, hard-headed, hard-nosed, hard-shell [U.S.], relentless, Spartan, Draconian, stringent, strait-laced, searching, unsparing, iron-handed, peremptory, absolute, positive, arbitrary, imperative; coercive etc. 744; tyrannical, extortionate, grinding, withering, oppressive, inquisitorial; inclement etc. (ruthless) 914.1; cruel etc. (malevolent) 907; haughty, arrogant etc. 885; precisian^†.    ... show more

Roget 885: insolent, haughty, arrogant, imperious, magisterial, dictatorial, arbitrary; high-handed, high and mighty; contumelious, supercilious, overbearing, intolerant, domineering, overweening, high-flown.    flippant, pert, fresh [U.S.], cavalier, saucy, forward, impertinent, malapert.    precocious, assuming, would-be, bumptious.    bluff; brazen, shameless, aweless, unblushing^†, unabashed; brazen, boldfaced-, barefaced-, brazen-faced; dead to shame, lost to shame.    impudent, audacious, presumptuous, free and easy, devil-may-care, rollicking; jaunty, janty^†; roistering, blustering, hectoring, swaggering, vaporing; thrasonic, fire eating, full of sound and fury" [Macbeth]. ... show more

Roget 737: at the head, dominant, paramount, supreme, predominant, preponderant, in the ascendant, influential; arbitrary; compulsory etc. 744; stringent.    at one's command; in one's power, in one's grasp; under control.    ... show more

Roget 608: capricious; erratic, eccentric, fitful, hysterical; full of whims etc. n.; maggoty; inconsistent, fanciful, fantastic, whimsical, crotchety, kinky [U.S.], particular, humorsome^†, freakish, skittish, wanton, wayward; contrary; captious; arbitrary; unconformable etc. 83; penny wise and pound foolish; fickle etc. (irresolute) 605; frivolous, sleeveless, giddy, volatile.    ... show more

Roget 606: obstinate, tenacious, stubborn, obdurate, casehardened; inflexible etc. (hard) 323; balky; immovable, unshakable, not to be moved; inert etc. 172; unchangeable etc. 150; inexorable etc. (determined) 604; mulish, obstinate as a mule, pig-headed.    dogged; sullen, sulky; unmoved, uninfluenced unaffected.    willful, self-willed, perverse; resty^†, restive, restiff^†; pervicacious^†, wayward, refractory, unruly; heady, headstrong; entete [Fr.]; contumacious; crossgrained^†.    arbitrary, dogmatic, positive, bigoted; prejudiced etc. 481; creed-bound; prepossessed, infatuated; stiff-backed, stiff necked, stiff hearted; hard-mouthed, hidebound; unyielding; impervious, impracticable, inpersuasible^†; unpersuadable; intractable, untractable^†; incorrigible, deaf to advice, impervious to reason; crotchety etc. 608.    ... show more

Roget 83: uncomformable, exceptional; abnormal, abnormous^†; anomalous, anomalistic; out of order, out of place, out of keeping, out of tune, out of one's element; irregular, arbitrary; teratogenic; lawless, informal, aberrant, stray, wandering, wanton; peculiar, exclusive, unnatural, eccentric, egregious; out of the beaten track, off the beaten track, out of the common, out of the common run; beyond the pale of, out of the pale of; misplaced; funny.    unusual, unaccustomed, uncustomary, unwonted, uncommon; rare, curious, odd, extraordinary, out of the ordinary; strange, monstrous; wonderful etc. 870; unexpected, unaccountable; outre [Fr.], out of the way, remarkable, noteworthy; queer, quaint, nondescript, none such, sui generis [Lat.]; unfashionable; fantastic, grotesque, bizarre; outlandish, exotic, tombe des nues [Fr.], preternatural; denaturalized^†.    heterogeneous, heteroclite [Gramm.], amorphous, mongrel, amphibious, epicene, half blood, hybrid; androgynous, androgynal^†; asymmetric etc. 243; adelomorphous^†, bisexual, hermaphrodite, monoclinous^†.    qualified etc. 469.    singular, unique, one-of-a-kind.    newfangled, novel, non-classical; original, unconventional, unheard of, unfamiliar; undescribed, unprecedented, unparalleled, unexampled.    ... show more

Roget 10: irrelative^†, irrespective, unrelated; arbitrary; independent, unallied; unconnected, disconnected; adrift, isolated, insular; extraneous, strange, alien, foreign, outlandish, exotic.    not comparable, incommensurable, heterogeneous; unconformable etc. 83.    irrelevant, inapplicable; not pertinent, not to the, purpose; impertinent, inapposite, beside the mark, a propos de bottes [Fr.]; aside from the purpose, away from the purpose, foreign to the purpose, beside the purpose, beside the question, beside the transaction, beside the point; misplaced etc. (intrusive) 24; traveling out of the record.    remote, far-fetched, out of the way, forced, neither here nor there, quite another thing; detached, segregate; disquiparant^†.    multifarious; discordant etc. 24.    incidental, parenthetical, obiter dicta, episodic.    ... show more

Roget 964: illegal [contrary to law], unlawful, illegitimate; not allowed, prohibited etc. 761; illicit, contraband; actionable.    unwarranted, unwarrantable; unauthorized; informal, unofficial; injudicial^†, extrajudicial.    lawless, arbitrary; despotic, despotical^†; corrupt, summary, irresponsible; unanswerable, unaccountable.    [of invalid or expired law] expired, invalid; unchartered, unconstitutional; null and void; a dead letter.    [in absence of law] lawless, unregulated ... show more

Polish: uznaniowy