irrational

Definition of irrational

ir`ra´tion`al   Pronunciation: ĭr`răsh´ŭn`al
a.1.
1.Not rational; void of reason or understanding; as, brutes are irrational animals.
2.Not according to reason; having no rational basis; clearly contrary to reason; easily disproved by reasoning; absurd; - of assertions and beliefs.
It seemed utterly irrational any longer to maintain it.
- I. Taylor.
3.(Math.) Not capable of being exactly expressed by an integral number, nor by a ratio of integral numbers; surd; - said especially of roots. See Surd.

Related Words

abnormal, absonant, algorismic, algorithmic, aliquot, bereft of reason, bigoted, brainless, brainsick, cardinal, contradictory, contrary to reason, crackbrained, cracked, crazed, crazy, daft, decimal, deluded, demented, deprived of reason, deranged, differential, digital, disoriented, distraught, even, exponential, extravagant, extreme, extremist, fallacious, fanatic, faulty, figural, figurate, figurative, finite, flawed, flighty, fractional, haggard, hallucinated, headless, ignorant, ill-advised, ill-considered, ill-contrived, ill-devised, ill-gauged, ill-judged, illogical, imaginary, impair, impolitic, impossible, imprudent, inadvisable, inauthentic, inconclusive, incongruous, inconsequent, inconsequential, inconsiderate, indiscreet, inept, inexpedient, infinite, injudicious, inordinate, insane, insensate, integral, invalid, lackbrained, lean-minded, lean-witted, loco, logarithmic, logometric, loose, lunatic, mad, maddened, manic, mazed, mental, mentally deficient, meshuggah, mindless, misadvised, misguided, moon-struck, myopic, negative, non compos, non compos mentis, nonrational, nonscientific, not all there, not bright, not following, not right, numeral, numerary, numerative, numeric, odd, of little brain, of unsound mind, off, ordinal, overenthusiastic, overreligious, overzealous, pair, paralogical, pea-brained, perfervid, pin-brained, positive, possible, prime, psycho, queer, rabid, radical, rational, real, reasonless, reciprocal, reckless, self-annulling, self-refuting, senseless, shortsighted, sick, slackminded, slackwitted, sophistic, stark-mad, stark-staring mad, strange, submultiple, surd, tetched, thoughtless, touched, transcendental, ultrazealous, unadvised, unauthentic, unbalanced, unconnected, unconsidered, undiscerning, unforeseeing, ungifted, unhinged, unintellectual, unintelligent, unphilosophical, unreasoning, unreflecting, unreflective, unsane, unscientific, unseeing, unsensible, unsettled, unsound, untalented, unthinking, unthoughtful, unwise, wandering, wild-eyed, wild-looking, without reason, witless, zealotic
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