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irrational - 20 thesaurus results
| 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 |
* = informal/non-formal usage
Roget's 21st Century Thesaurus, Third Edition
Copyright © 2009 by the Philip Lief Group.
Cite This Source
Roget's 21st Century Thesaurus, Third Edition
Copyright © 2009 by the Philip Lief Group.
Cite This Source
Copyright © 2009, Dictionary.com, LLC. All rights reserved.

