unreasonable synonym | Thesaurus.com

Main Entry:	unreasonable
Part of Speech:	adjective
Definition:	not logical or sensible
Synonyms:	absurd, arbitrary, biased, capricious, contradictory, erratic, fallacious, far-fetched, foolish, headstrong, illogical, incoherent, incongruous, inconsequential, inconsistent, invalid, irrational, loose, mad, nonsensical, off the wall, opinionated, preposterous, quirky, senseless, silly, stupid, thoughtless, vacant, wrong, all wet, full of hot air, reasonless, unreasoned
Antonyms:	logical, practical, pragmatic, realistic, reasonable, sensible

Main Entry:	unreasonable
Part of Speech:	adjective
Definition:	extravagant; beyond normal limits
Synonyms:	arbitrary, dear, excessive, exorbitant, extortionate, extreme, far-out, illegitimate, immoderate, improper, inordinate, intemperate, out of bounds, peremptory, posh, senseless, steep, stiff, too much, uncalled-for, unconscionable, undue, unfair, unjust, unjustifiable, unlawful, unwarranted, way out, wrongful, absonant, costing an arm and a leg, overkill*, overmuch, pricey, too great, too-too, unrightful, unwarrantable, up to here
Antonyms:	cheap, economical, low, plain, reasonable

* = informal/non-formal usage

Main Entry:	absurd
Part of Speech:	adjective
Definition:	ridiculous, senseless
Synonyms:	batty, crazy, daffy, flaky, foolish, goofy, idiotic, illogical, inane, incongruous, irrational, laughable, loony, ludicrous, nonsensical, nutty, off the wall, preposterous, sappy, screwy, silly, stupid, unreasonable, wacky, campy, dippy, fooling around, for grins, freaky, gagged up, jokey, joshing, tomfool
Antonyms:	certain, logical, rational, reasonable, sensible, wise

* = informal/non-formal usage

Main Entry:	capricious
Part of Speech:	adjective
Definition:	given to sudden behavior change
Synonyms:	arbitrary, careless, contrary, crotchety, effervescent, erratic, every which way, fanciful, fickle, fitful, flaky, flighty, freakish, helter-skelter, impulsive, inconstant, kinky, mercurial, moody, mutable, odd, picky, punchy, queer, quirky, temperamental, ticklish, unpredictable, unreasonable, unstable, variable, volatile, wayward, whimsical, any way the wind blows, blowing hot and cold, changeful, gaga, humorsome, lubricious, notional, up and down, vagarious, yo-yo
Antonyms:	constant, dependable, sensible, staid, steadfast, steady

* = informal/non-formal usage

Main Entry:	disproportionate
Part of Speech:	adjective
Definition:	out of balance
Synonyms:	excessive, incommensurate, inordinate, irregular, lopsided, superfluous, too much, unequal, uneven, unreasonable, asymmetric, nonsymmetrical, out of proportion, overbalanced, unsymmetrical
Antonyms:	balanced, equal, even, proportionate

Main Entry:	excessive
Part of Speech:	adjective
Definition:	too much; overdone
Synonyms:	boundless, disproportionate, dissipated, enormous, exaggerated, exorbitant, extra, extravagant, extreme, immoderate, indulgent, inordinate, intemperate, limitless, more, needless, over, prodigal, profligate, redundant, self-indulgent, steep, stiff, super, superfluous, supernatural, towering, unconscionable, undue, unreasonable, way out, dizzying, overboard, overkill, overmuch, plethoric, recrementitious, sky-high, stratospheric, superabundant, too many, unbounded, unmeasurable
Antonyms:	insufficient, moderate, reasonable, underdone

Main Entry:	exorbitant
Part of Speech:	adjective
Definition:	extravagant, excessive
Synonyms:	absonant, dear, enormous, exacting, expensive, extortionate, extreme, high, highway robbery, immoderate, inordinate, out of sight, outrageous, over one's head, overboard, overmuch, preposterous, pricey, steep, stiff, towering, unconscionable, undue, unreasonable, unwarranted, up to here, wasteful
Antonyms:	cheap, inexpensive, low, moderate, reasonable, sensible

* = informal/non-formal usage

Main Entry:	expensive
Part of Speech:	adjective
Definition:	high-priced
Synonyms:	costly, dear, excessive, exorbitant, extravagant, fancy, high, highway robbery, holdup, immoderate, inordinate, invaluable, lavish, out of sight, plush, posh, rich, ritzy, steep, stiff, unreasonable, valuable, an arm and a leg, at a premium, big-ticket, overpriced, pretty penny, pricey, sky-high, swank, too high, uneconomical, upscale
Antonyms:	cheap, inexpensive, low-priced, moderate, reasonable

* = informal/non-formal usage

Main Entry:	extravagant
Part of Speech:	adjective
Definition:	indulgent, wasteful
Synonyms:	absurd, bizarre, costly, crazy, exaggerated, excessive, exorbitant, expensive, extortionate, extreme, fanciful, fancy, fantastic, flamboyant, flashy, foolish, garish, gaudy, grandiose, immoderate, implausible, improvident, imprudent, inordinate, lavish, ludicrous, nonsensical, ornate, ostentatious, outrageous, preposterous, pretentious, prodigal, profligate, reckless, ridiculous, showy, silly, spendthrift, steep, unbalanced, unconscionable, unreasonable, unrestrained, overpriced
Antonyms:	close, economical, moderate, provident, reasonable, saving, stingy, thrifty, unpretentious

Main Entry:	fallacious
Part of Speech:	adjective
Definition:	false, wrong
Synonyms:	deceptive, delusive, erroneous, fictitious, fishy, fraudulent, illogical, illusory, incorrect, invalid, irrational, mad, misleading, mistaken, off, phony, spurious, unfounded, unreal, unreasonable, unsound, untrue, beguiling, deceiving, deluding, delusory, reasonless, sophistic, sophistical, ungrounded, unreasoned, way off
Notes:	fallacious means intended to deceive; fallible means liable to make a mistake or to be inaccurate or erroneous; false means not in accordance with the fact or reality or actuality, or deliberately deceptive, or not genuine or real
Antonyms:	correct, real, true, truthful

* = informal/non-formal usage

Main Entry:	foolish
Part of Speech:	adjective
Definition:	nonsensical, idiotic
Synonyms:	absurd, asinine, brainless, crazy, daffy, daft, dotty, fantastic, fatuous, feebleminded, half-baked, half-witted, harebrained, ill-advised, imprudent, incautious, indiscreet, injudicious, insane, irrational, jerky, loony, ludicrous, lunatic, mad, moronic, nutty, preposterous, ridiculous, senseless, short-sighted, silly, simple, stupid, unintelligent, unreasonable, unwise, wacky, weak, witless, zany*, cockamamy, dippy, doltish, ill-considered, imbecilic, kooky, nerdy
Antonyms:	careful, cautious, circumspect, prudent, sensible, serious, thoughtful, wise, unfoolish

* = informal/non-formal usage

Main Entry:	illogical
Part of Speech:	adjective
Definition:	not making sense
Synonyms:	absurd, cockeyed, fallacious, false, fatuous, faulty, groundless, hollow, implausible, inconclusive, incongruous, inconsistent, incorrect, invalid, irrational, irrelevant, mad, meaningless, nutty, off the wall, preposterous, screwy*, senseless, specious, spurious, unconnected, unreasonable, unscientific, unsound, unsubstantial, untenable, wacky, casuistic, inconsequent, not following, self-contradictory, sophistic, sophistical, unproved, without basis, without foundation
Antonyms:	correct, logical, meaningful, rational, reasonable, right, sensible

* = informal/non-formal usage

Main Entry:	immoderate
Part of Speech:	adjective
Definition:	excessive, extreme
Synonyms:	egregious, enormous, exaggerated, exorbitant, extravagant, inordinate, intemperate, profligate, steep, too much, towering, unbalanced, unbridled, uncalled-for, unconscionable, uncontrolled, undue, unjustified, unreasonable, unrestrained, unwarranted, wanton, dizzying, overindulgent, too-too, unmeasurable
Antonyms:	calm, mild, moderate, reasonable, restrained, justified

* = informal/non-formal usage

Main Entry:	implausible
Part of Speech:	adjective
Definition:	not likely
Synonyms:	doubtful, dubious, far out, farfetched, fishy, flimsy, for the birds, full of holes, impossible, improbable, inconceivable, incredible, obscure, problematic, puzzling, reachy, suspect, thin, too much*, unbelievable, unconvincing, unreasonable, unsubstantial, weak, won't hold water, won't wash
Antonyms:	believable, likely, plausible, possibly, probably, reasonable

* = informal/non-formal usage

Main Entry:	inadmissible
Part of Speech:	adjective
Definition:	not appropriate
Synonyms:	ill-favored, ill-timed, immaterial, improper, inappropriate, inapt, incompetent, inept, irrelevant, malapropos, objectionable, unacceptable, unbecoming, undesirable, unfit, unqualified, unreasonable, unsatisfactory, unseemly, unsuited, unwanted, unwelcome, exceptionable, unallowable
Antonyms:	acceptable, admissible, allowable, appropriate

Main Entry:	inordinate
Part of Speech:	adjective
Definition:	excessive, extravagant
Synonyms:	disproportionate, exorbitant, extortionate, extreme, gratuitous, immoderate, intemperate, irrational, outrageous, preposterous, superfluous, surplus, too much, towering, uncalled-for, unconscionable, undue, unreasonable, unrestrained, unwarranted, wanton, wasteful, dizzying, overindulgent, overmuch, supererogatory, uncurbed, unmeasurable, untempered
Antonyms:	moderate, reasonable, warranted, ok enough

Main Entry:	irrational
Part of Speech:	adjective
Definition:	illogical, senseless
Synonyms:	aberrant, absurd, brainless, crazy, delirious, demented, disconnected, disjointed, distraught, fallacious, flaky, foolish, incoherent, injudicious, insane, invalid, loony, mad, mindless, nonsensical, nutty, preposterous, raving, ridiculous, silly, specious, stupid, unreasonable, unsound, unstable, unthinking, unwise, wacky, wild, wrong, cockamamie, freaky, kooky, off-the-wall, reasonless, sophistic, unreasoning
Antonyms:	logical, rational, reasonable, reflective, sensible, sound, stable

* = informal/non-formal usage

Main Entry:	lavish
Part of Speech:	adjective
Definition:	profuse; splendid
Synonyms:	abundant, bountiful, copious, effusive, exaggerated, excessive, extravagant, exuberant, first-class, free, generous, gorgeous, grand, immoderate, impressive, improvident, inordinate, intemperate, liberal, lush, luxuriant, luxurious, munificent, openhanded, opulent, plentiful, plush, posh, prodigal, profligate, prolific, riotous, ritzy, sumptuous, swanky, unreasonable, unrestrained, unsparing, wasteful, wild, profusive, thriftless, unstinging
Antonyms:	economical, scanty, scarce, small, spare

Main Entry:	misguided
Part of Speech:	adjective
Definition:	ill-advised, deluded
Synonyms:	bearded, confused, deceived, erroneous, foolish, imprudent, indiscreet, inexpedient, injudicious, misled, misplaced, mistaken, unreasonable, unwarranted, unwise, wrong, bum-steer, disinformed, faked-out, led up the garden path, stonewalled, uncalled for
Antonyms:	well-guided

Main Entry:	perverse
Part of Speech:	adjective
Definition:	mean, ornery; troublesome
Synonyms:	abnormal, bad-tempered, cantankerous, capricious, contradictory, contrary, contumacious, corrupt, crabby, cross, degenerate, delinquent, depraved, deviant, disobedient, dogged, erring, fractious, hard-nosed, headstrong, intractable, intransigent, irritable, miscreant, mulish, nefarious, obdurate, obstinate, petulant, pigheaded, rebellious, refractory, rotten*, spiteful, stubborn, unhealthy, unmanageable, unreasonable, unyielding, villainous, wayward, wicked, willful, self-willed
Antonyms:	agreeable, compliant, happy, nice, reasonable, willing