irrational synonym | Thesaurus.com

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:	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:	deranged
Part of Speech:	adjective
Definition:	crazy, insane
Synonyms:	ape, baked, berserk, cracked, crazed, delirious, demented, disconcerted, disordered, displaced, distracted, dotty, frantic, frenzied, fried, irrational, lunatic, mad, maniac, maniacal, nuts, perplexed, unbalanced, unhinged*, unsettled, unsound, bananas, disarranged, flipped, flipped out, loco, maddened, schizzo, unglued, unscrewed, unzipped, whacko
Antonyms:	balanced, calm, sane, ok

* = informal/non-formal usage

Main Entry:	disconnected
Part of Speech:	adjective
Definition:	confused; discontinuous
Synonyms:	broken, detached, disjointed, disordered, illogical, inchoate, incoherent, interrupted, irrational, irregular, jumbled, loose, mixed-up, muddled, rambling, separated, uncoordinated, unintelligible, wandering, garbled, incohesive, uncontinuous
Antonyms:	coherent, connected, continuous, intelligible, joined, understandable, attached

Main Entry:	disjointed
Part of Speech:	adjective
Definition:	loose, disconnected
Synonyms:	aimless, confused, cool, discontinuous, disordered, displaced, divided, far-out, fitful, fuzzy, inchoate, incoherent, irrational, jumbled, muddled, rambling, separated, spasmodic, split, unattached, unconnected, unorganized, disunited, incohesive, out-of-it, out-to-lunch, spaced-out, spacey
Antonyms:	coherent, connected, contiguous, ordered, united, jointed

Main Entry:	emotional
Part of Speech:	adjective
Definition:	demonstrative about feelings
Synonyms:	affecting, ardent, disturbed, ecstatic, enthusiastic, excitable, exciting, fanatical, feeling, fervent, fervid, fickle, fiery, heartwarming, heated, histrionic, hysterical, impassioned, impetuous, impulsive, irrational, moving, nervous, overwrought, passionate, pathetic, poignant, responsive, sensitive, sentient, sentimental, spontaneous, stirring, susceptible, temperamental, tender, thrilling, touching, warm, zealous, emotive, falling apart, hot-blooded, roused, stirred, tear-jerking
Notes:	emotional means 'affected by an emotion' while emotive means 'drawing out or evoking emotion'
Antonyms:	physical

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
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:	incoherent
Part of Speech:	adjective
Definition:	unintelligible
Synonyms:	breathless, confused, disconnected, discontinuous, discordant, disjointed, disordered, dumb, inarticulate, incomprehensible, incongruous, inconsistent, indistinct, indistinguishable, irrational, jumbled, muddled, muffled, mute, puzzling, rambling, tongue-tied*, uncommunicative, unconnected, uncoordinated, uneven, wandering, wild, faltering, incohesive, maundering, mumbling, muttered, stammering, stuttering, unvocal
Antonyms:	coherent, intelligible, understandable

* = informal/non-formal usage

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:	insane
Part of Speech:	adjective
Definition:	mentally ill; foolish
Synonyms:	batty, bizarre, cracked, crazed, crazy, cuckoo, daft, demented, derailed, deranged, fatuous, frenzied, idiotic, impractical, irrational, irresponsible, loony, lunatic, mad, maniacal, mental, moonstruck, nuts, nutty, of unsound mind, off one's rocker, out of one's mind, paranoid, preposterous, psychopathic, psychotic, rabid, raging, raving, schizophrenic, screwy, senseless, touched, unhinged, unsettled, wild
Antonyms:	balanced, healthy, rational, reasonable, sane, sound, well

* = informal/non-formal usage

Main Entry:	lunatic
Part of Speech:	adjective
Definition:	crazy, mad
Synonyms:	absurd, baked, balmy, bonkers, cracked, crazed, daft, demented, deranged, flaky, foolish, fried, idiotic, insane, irrational, maniac, maniacal, nonsensical, nutty, preposterous, psychotic, screwy*, stupid, unsound, zany, bananas, dippy, flipped out, freaked out, kooky, loco, psyched out, schizoid, whacko
Antonyms:	healthy, sane, sensible

* = informal/non-formal usage

Main Entry:	nuts/nutty
Part of Speech:	adjective
Definition:	mentally deranged
Synonyms:	absurd, batty, bedlamite, cracked, crazy, daffy, daft, demented, eccentric, enthusiastic, foolish, gung ho, harebrained, insane, irrational, keen, kooky, loony, lunatic, mad, out of one's mind, ridiculous, touched, unusual, wacky*, warm, zealous
Antonyms:	balanced, calm, sane, well

* = informal/non-formal usage

Main Entry:	phobic
Part of Speech:	adjective
Definition:	fearful
Synonyms:	afraid, anxious, apprehensive, disturbed, frightened, irrational, jittery, jumpy, nervous, neurotic, scared, shy, skittish, tense, worried, discomposed, disquieted, have cold feet, panicky

Main Entry:	preposterous
Part of Speech:	adjective
Definition:	ridiculous, bizarre
Synonyms:	absurd, asinine, crazy, excessive, exorbitant, extravagant, extreme, fantastic, far-out, foolish, harebrained, impossible, incredible, insane, irrational, laughable, ludicrous, monstrous, nonsensical, out of the question, outrageous, senseless, shocking, silly, stupid, thick, too much, unbelievable, unreasonable, unthinkable, unusual, wacky*, wild, taking the cake
Antonyms:	reasonable, sensible

* = informal/non-formal usage

Main Entry:	rabid
Part of Speech:	adjective
Definition:	very angry; maniacal
Synonyms:	berserk, bigoted, bitten, crazed, crazy, delirious, deranged, enthusiastic, extreme, extremist, fanatical, fervent, frantic, frenetic, frenzied, furious, hot, infuriated, insane, intemperate, intolerant, irrational, keen, mad, narrow-minded, nutty, obsessed, poisoned, radical, raging, revolutionary, sick, ultra, violent, virulent, wild, zealous, corybantic, flipped, foaming at the mouth, freaked out, mad-dog, overboard, sizzling, smoking, steamed up, ultraist
Antonyms:	delighted, happy, pleased

* = informal/non-formal usage

Main Entry:	rash
Part of Speech:	adjective
Definition:	careless, impulsive
Synonyms:	adventurous, audacious, bold, brash, daring, determined, devil-may-care*, fiery, foolhardy, frenzied, furious, harebrained, hasty, headlong, headstrong, heedless, hotheaded, ill-advised, immature, impetuous, imprudent, incautious, indiscreet, injudicious, irrational, madcap, passionate, precipitate, premature, reckless, thoughtless, unguarded, unthinking, unwary, venturesome, wild, ill-considered, insuppressible, jumping to conclusions, overhasty, precipitant, venturous
Antonyms:	careful, cautious, planned, thoughtful

* = informal/non-formal usage

Main Entry:	scatterbrained
Part of Speech:	adjective
Definition:	not thinking clearly
Synonyms:	careless, dizzy, empty-headed, featherbrained, flighty, forgetful, frivolous, giddy, harebrained, illogical, inattentive, irrational, irresponsible, madcap, silly, slaphappy, stupid, thoughtless, birdbrained
Antonyms:	aware, careful, sensible, thoughtful

* = informal/non-formal usage

Main Entry:	senseless
Part of Speech:	adjective
Definition:	silly, meaningless
Synonyms:	absurd, asinine, batty, crazy, daft, double talk, fatuous, flaky, foolish, idiotic, illogical, inane, incongruous, inconsistent, insignificant, irrational, ludicrous, mad, mindless, moronic, nonsensical, nutty, pointless, purposeless, ridiculous, simple, stupid, trivial, unimportant, unintelligent, unreasonable, unsound, unwise, wacky*, doublespeak, imbecilic, purportless, unmeaning, without rhyme or reason
Antonyms:	feeling, intelligent, rational, reasonable, sensible, wise