thesaurus.rky.pl

Here are words similar to optional:
a beneplacito, a discretion, abandoned, ablative, able, abounding in riches, above, absolute, absolutist, absolutistic, absolve, absurd, academic specialty, accessible, accorded, acquit, ad arbitrium, ad lib, ad libitum, additional, adjectival, adjective, adoptive, adrift, adverb, adverbial, adversative conjunction, advised, affluent, affranchise, afloat, afoot and lighthearted, agent, aimed, aimed at, aimless, al piacere, alien, allowed, alternate, alternate choice, alternative, amnesty, amorphous, analogy, another, anythingarian, apart, apart from, apathetic, appointive, approachable, arbitrary, area, aristocratic, arrogant, artless, as a gift, as our guest, aside from, at choice, at large, at leisure, at liberty, at loose ends, at pleasure, at will, attainable, attributive, autarchic, autarkic, authoritarian, authoritative, autocratic, automated, automatic, automatous, autonomous, autonomousness, autonomy, available, avant-propos, backup, bald, balking, balky, bare, barring, baseless, bat, baton, besides, bestowed, beyond, big-rich, biggety, bighearted, bigoted, billy, billy club, biodegradable, bludgeon, bluff, blunt, bold, bossy, bottomless, bounteous, bountiful, brash, break loose, break out, breakthrough, broad, broken, broken off, brusque, bulldogged, bulletheaded, bullheaded, bureaucratic, calculated, candid, capricious, careless, case-hardened, cast off, casual, centrist, chance, chancy, change, changeling, charitable, cheeky, choice, choosing, choosy, chopped-off, choppy, chosen, chutzpadik, civic, civil, classical education, cleanse, cleanse away, clear, clear of, cleared, club, cocky, come forward, comfortable, communicative, comparison, competent, complimentary, conative, concert overture, conjunction, conjunctive adverb, conscious, considered, constituent, constitutional, contemplated, contemptuous, contingency, controlled, contumacious, conversable, coordinating conjunction, copulative, copulative conjunction, copy, core curriculum, correlative conjunction, corrosive, costless, counterfeit, course, course of study, cranky, crotchety, crusty, curriculum, curtain raiser, cut loose, cybernated, de trop, debauched, decided, decomposable, decomposing, decontaminate, decousu, degradable, deliberate, deliberated, deliver, delivered, democratic, demonstrative, deobstruct, deputy, derisive, descant, deserted, designed, despotic, destigmatize, desultory, detach, detached, determined, dictatorial, different, diffuse, dilapidated, direct, disarticulated, disburden, discharge, discipline, disclose, disclosed, disconnected, discontinued, discontinuous, discourteous, discrete, discretion, discretional, discretionary, discriminating, disembarrass, disembroil, disencumber, disengage, disengaged, disentangle, disenthrall, disgustingly rich, disintegrable, disintegrated, disintegrating, disintegrative, disinterested, disinvolve, disjoin, disjunct, disjunctive, disjunctive conjunction, dislodge, dismiss, disobedient, disordered, dispassionate, dispensable, dispense from, dispense with, disperse, dispersed, disproportionate, disregarded, disrelated, disrespectful, disruptive, dissipated, dissociated, dissolute, distinct, dividing, do independently, do voluntarily, doff, dogged, dogmatic, domineering, double, doubtful, downright, dramatic overture, druthers, dummy, ease, ease off, easy, easygoing, eclectic, effusive, elected, election, elective, electoral, eleemosynary, emancipate, emancipated, empty, enfranchise, enfranchised, envisaged, envisioned, episodic, equal, equitable, equivalent, erect, erosive, erratic, ersatz, escape clause, escape hatch, escaped, even, evenhanded, except, except for, excess, exchange, exchangeable, exclamatory noun, excluding, exclusive of, exculpate, excuse, exempt, exempt from, exonerate, exordium, exotic, expansive, expendable, expenseless, expletive, explicit, expose, exposed, extemporaneous, extempore, external, extra, extract, extraneous, extricate, extricated, extroverted, factious, facy, fair, fake, fallow, fanatic, fanciful, fantasied, fantastic, fascist, fast, fat, federal, federalist, federalistic, fence-sitter, feudal, field, fifty-fifty, fill-in, firm-minded, fitful, flaky, fled, flip, flippant, floating, flown, flush, foolish, footloose, footloose and fancy-free, for free, for love, for nothing, for the asking, foreign, foreword, forgive, form class, form word, formless, forsaken, forthright, forward, frank, frankhearted, freakish, free, free and easy, free as air, free for nothing, free from, free gratis, free lance, free of, free of charge, free of cost, free spirit, free trader, free up, free will, free-born, free-speaking, free-spirited, free-spoken, free-tongued, freebie, freeborn, freed, freehanded, freehearted, freely, freethinker, freewheeling, fresh, frightfully rich, frivolous, front matter, frontispiece, froward, fugitive, function class, furlough, gallant, gally, gay, general education, general studies, generous, genuine, gerundive, get out, ghost, ghostwriter, giftlike, give absolution, give dispensation from, give release, give respite, given, giving, go-go, God-given, gossipy, governmental, gracious, grant amnesty to, grant immunity, grant remission, granted, gratis, gratuitous, gratuitously, gratuitousness, greathearted, grinding, groundless, gubernatorial, gut, half-and-half, half-done, handsome, haphazard, hardheaded, harebrained, headstrong, heady, heart-to-heart, heedless, herky-jerky, heteronomous, high-handed, hit-or-miss, honest, hospitable, house-proud, humanities, humorsome, idle, iffy, ignored, ignoring, ill-advised, ill-considered, ill-devised, ill-mannered, imitation, immediate, immethodical, immoderate, impartial, imperative, imperial, imperious, impersonal, impertinent, impetuous, impolite, importunate, impregnable, impromptu, improvised, impudent, impulsive, in excess, in funds, in the clear, in the money, inadvertent, inchoate, incoherent, incommensurable, incomparable, inconsiderate, inconsistent, incontinent, indefensible, indeliberate, independence, independent, independently rich, independently wealthy, indifferent, indisciplined, indiscreet, indiscriminate, individual, individualist, individualistic, indomitable, indulgent, inessential, inexpugnable, informal, ingenuous, inherent, innate, inner-directed, innovation, instinctive, instinctual, insubordinate, insular, intemperate, intended, intentional, interchangeable, interjection, intermit, intermittent, interrupted, intolerant, intractable, introduction, intrusive, involuntary, invulnerable, irrational, irregular, irrelative, irrepressible, irrespective of, irresponsible, isolated, isolationist, jagged, jerky, jobless, just, justify, kinky, knowing, kooky, laid aside, Laodicean, large, largehearted, latitudinarian, lavish, lawless, lax, leap, left undone, leisure, leisured, let go, let loose, let off, let out, let up, liberal, liberal arts, liberate, liberated, libertarian, libertine, libidinal, licentious, loaded, locum tenens, lofty, loner, loophole, loose, loosely, loosen, lordly, lumpen, luxurious, mace, made of money, maggoty, magisterial, magistral, magnanimous, major, makeshift, malapert, manifest, manumit, masterful, matriarchal, matriarchic, maverick, meaningless, meant, mechanical, meditated, metaphor, metonymy, midway, minor, missed, misshapen, mock, moderate, moldering, monarchal, monarchial, monarchic, moneyed, monocratic, moody, motiveless, mugwump, mugwumpian, mugwumpish, mulish, munificent, mutinous, naked, natural, naughty, need no prodding, needless, neglected, nervy, neuter, neutral, newsy, next best thing, nightstick, nonaligned, noncommitted, nonconforming, nonconformist, noncontinuous, nonessential, nonlinear, nonmandatory, nonpartisan, nonpros, nonrestrictive, nonsequential, nonserial, nonsymmetrical, nonsystematic, nonuniform, nothingarian, notional, notwithstanding, objective, obstinate, of design, off, off duty, off the cuff, off work, offered, offhand, official, officious, oligarchal, oligarchic, Olympian, omitted, on one, on parole, on the fence, on the house, on the loose, oofy, open, open-handed, openhanded, openhearted, openly, operatic overture, opinionated, oppressive, option, optional, optionality, opulent, oracular, orderless, other, out, out of, out of control, out of employ, out of hand, out of harness, out of work, outgoing, outlandish, outright, outside, outspoken, overbearing, overlooked, overruling, overture, overzealous, pardon, parenthetic, parliamentarian, parliamentary, parole, part of speech, participle, particle, particular, parting, passed by, passed over, passed up, passive, past participle, patchy, patefy, patriarchal, patriarchic, peremptory, perfect participle, permissive, permitted, persevering, personnel, pert, pertinacious, perverse, petulant, phony, pigeonholed, pigheaded, pinch, pinch hitter, plain, plain-spoken, planless, planned, pleasure, pleonastic, pluralistic, political, possibility, possible choice, postulate, preamble, precipitate, preface, preference, prefix, prefixture, preliminary, prelude, premeditated, premise, preposition, preposterous, present participle, presumptuous, presupposition, pretext, prideful, princely, proem, proffered, profligate, profuse, projected, prolegomena, prolegomenon, prolepsis, prolix, prologue, promiscuous, proposed, proseminar, prosperous, protasis, proud, proud as Lucifer, proud-blooded, proud-looking, proud-minded, proud-spirited, proudful, proudhearted, provided for, providential, provisional, proxy, purge, purge away, purposed, purposeful, purposive, purse-proud, pushy, put aside, quadrivium, quash the charge, quirky, quit, quit of, rakehell, rakehellish, rakehelly, rakish, rampant, random, ransom, rash, ravaged, reasonless, recover, recusant, redeem, redeemed, redundant, reflex, reflexive, refresher course, reinless, relax, relaxed, release, released, relief, relieve, remise, remit, remove, removed, replacement, replacing, representative, repressive, reprieve, republican, rescue, rescued, reserve, reserves, resolved, resolvent, restive, retired, retrieve, reveal, rich, rich as Croesus, rickety, rid, rid of, ringer, riotous, rolling in money, round, rude, rugged individualist, ruinous, runaway, salvage, sassy, saucy, save, save the necessity, saving clause, scatter, scientific education, scot-free, scrappy, screwball, second string, secondary, segregate, selecting, selection, selective, self-acting, self-action, self-active, self-activity, self-adjusting, self-asserting, self-assertive, self-assured, self-centered, self-closing, self-confident, self-contained, self-controlled, self-cooking, self-dependent, self-determination, self-determined, self-determining, self-directed, self-directing, self-dumping, self-esteeming, self-expressive, self-governed, self-governing, self-helpful, self-helping, self-improving, self-lighting, self-operative, self-possessed, self-regulative, self-reliant, self-respecting, self-restrained, self-revealing, self-revelatory, self-starting, self-subsistent, self-sufficient, self-supporting, self-sustained, self-sustaining, self-willed, self-winding, self-working, selfless, semiautomatic, seminar, semiretired, senseless, separate, separated, separating, separative, set, set at large, set at liberty, set free, severe, shaky, shapeless, shed of, shrive, shunted, shut of, sidelined, sidetracked, sign, silly, simple, sincere, slack, slack off, slacken, slighted, smart, smart-alecky, smart-ass, snap, snatchy, sociable, solvent, sovereign, spare, spares, spasmodic, specialty, spontaneity, spontaneous, spontaneousness, spontoon, sporadic, spotty, spring, sprung, spur-of-the-moment, stalwart, stand-in, step forward, stiff-necked, stintless, stopgap, stout, straggling, straggly, straight, straight-out, straightforward, strange, strict, strong, strong-minded, strong-willed, strongheaded, stubborn, studied, study, sturdy, sub, subdiscipline, subject, subjective, subliminal, subordinating conjunction, substituent, substitute, substitution, succedaneum, sulky, sullen, summary, supererogatory, superfluous, superseder, supplanter, suppressive, surrogate, suspend, suspended, swing vote, symbol, synecdoche, systemless, take off, talkative, tautologic, tautologous, tear loose, technical education, teleological, temperamental, temporary, tenacious, tenantless, tentative, theocratic, third force, third string, third world, third-force, third-world, thoughtless, to his heirs, to spare, token, totalitarian, tough, transgressive, transparent, trivium, truncheon, tyrannical, tyrannous, unacceptable, unaccountable, unadvised, unaffected, unaffiliated, unagreeable, unallied, unanchored, unannounced, unarranged, unasked, unasked-for, unassailable, unassociated, unattached, unattended to, unbar, unbeatable, unbesought, unbiased, unbidden, unbind, unblock, unbolt, unbought, unbound, unbridled, unbuckle, unburden, unbutton, uncage, uncalculated, uncalculating, uncalled for, uncalled-for, uncared-for, uncase, unceremonious, uncertain, unchain, unchained, unchaperoned, unchecked, uncivil, unclasp, unclassified, unclench, unclog, unclogged, unclosed, unclutch, unclutter, uncoerced, uncommitted, uncommitted voter, uncompelled, uncomplying, uncompromising, unconditional, unconditioned, unconfined, unconnected, unconquerable, unconscious, unconsidered, unconstrained, uncontrolled, uncooperative, uncork, uncover, uncovered, uncurbed, uncurtain, undazzled, undecided, undefeatable, undeliberate, undeliberated, understudy, undesigned, undesirable, undesired, undirected, undisciplined, undo, undone, undrape, unduteous, undutiful, unearned, unemployable, unemployed, unencumbered, unengaged, unenslaved, unequivocal, unessential, unfasten, unfastened, unfetter, unfettered, unfilled, unfixed, unfold, unforced, unforcedness, unfoul, unfounded, unglue, ungoverned, ungracious, ungraded, ungrounded, ungrudging, unguarded, unguided, unhampered, unhidden, unhindered, unimpeded, uninfluenced, uninhabited, uninhibited, unintended, unintentional, uninvited, uninvolved, unjaundiced, unjoined, unjustifiable, unjustified, unknot, unlace, unlatch, unlearned, unleash, unlimited, unlock, unlooked-for, unloose, unloosen, unmanned, unmastered, unmeant, unmeasured, unmeditated, unmethodical, unmoved, unmuzzled, unnecessary, unneeded, unobstructed, unoccupied, unordered, unorganized, unpaid-for, unpeopled, unplanned, unplug, unpopulated, unpredictable, unprejudiced, unpremeditated, unprepared, unprepossessed, unpressured, unprompted, unpurposed, unravel, unreasonable, unreasoning, unreflecting, unregarded, unregenerate, unrehearsed, unreined, unrelatable, unrelated, unrepressed, unrequested, unrequired, unreserved, unreservedly, unrestrained, unrestricted, unrestrictive, unreticent, unroll, unruly, unscramble, unseal, unsecretive, unselfish, unshackle, unshackled, unsheathe, unshrinking, unshut, unsilent, unsnarl, unsolicited, unsophisticated, unsorted, unsought, unsparing, unstaffed, unstick, unstinted, unstinting, unstop, unstopped, unstrap, unstuck, unstudied, unsubdued, unsuccessive, unsupportable, unsuppressed, unswayed, unsymmetrical, unsystematic, untaken, untangle, untaxed, untenanted, untended, unthinking, unthought-of, unthoughtful, untie, untied, ununiform, unused, unveil, unwanted, unwarranted, unwatched, unwelcome, unwilled, unwished, unwitting, unwrap, utility, utility player, vacant, vagarious, vagrant, vague, vamp, variant, varying, verbal adjective, verbose, verse, vicar, vicarious, vice-president, vice-regent, vindicate, violative, volitional, voluntariness, voluntarism, voluntary, voluntaryism, volunteer, volunteer militia, volunteer navy, volunteering, Vorspiel, vouchsafed, wallowing in wealth, wandering, wanton, warm, way of escape, way out, wayward, wealthy, weigh anchor, well out of, well provided for, well-fixed, well-heeled, well-off, well-to-do, whimsical, whitewash, wide-open, wild, wildcat, willful, willing, wise-ass, with abandon, withdraw the charge, without, without charge, without coercion, without restraint, witting,