Meaning of IRRATIONAL
Pronunciation:   i'rashunl



WordNet Dictionary 

 Definition:  
 [adj] not consistent with or using reason; "irrational fears"; "irrational animals"
 [adj] (math) real but not expressible as the quotient of two integers; "irrational numbers"


IRRATIONAL is a 10 letter word that starts with I. 
 Synonyms:   blind, incoherent, jaundiced, nonrational, reasonless, superstitious, unreasoning, yellow 

 Antonyms:   rational, rational  
 See Also:   illogical, unlogical, unreasonable  
Webster's 1913 Dictionary 

 Definition:   \Ir*ra"tion*al\, a. [L. irrationalis: cf. F.
irrationnel. See {In} not, and {Rational}.]
1. Not rational; void of reason or understanding; as, brutes
are irrational animals.
2. Not according to reason; absurd; foolish.
It seemed utterly irrational any longer to maintain
it. I. Taylor.
3. (Math.) Not capable of being exactly expressed by an
integral number, or by a vulgar fraction; surd;  said
especially of roots. See {Surd}.
Syn: Absurd; foolish; preposterous; unreasonable; senseless.
See {Absurd}.


Thesaurus Terms 

 Related Terms:   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, foolish, fractional, haggard, hallucinated, headless, ignorant, illadvised, illconsidered, illcontrived, illdevised, illgauged, illjudged, illogical, imaginary, impair, impolitic, impossible, imprudent, inadvisable, inauthentic, inconclusive, incongruous, inconsequent, inconsequential, inconsiderate, inconsistent, indiscreet, inept, inexpedient, infinite, injudicious, inordinate, insane, insensate, integral, invalid, lackbrained, leanminded, leanwitted, loco, logarithmic, logometric, loose, lunatic, mad, maddened, manic, mazed, mental, mentally deficient, meshuggah, mindless, misadvised, misguided, moonstruck, 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, peabrained, perfervid, pinbrained, positive, possible, prime, psycho, queer, rabid, radical, rational, real, reasonless, reciprocal, reckless, selfannulling, selfcontradictory, selfrefuting, senseless, shortsighted, sick, slackminded, slackwitted, sophistic, starkmad, starkstaring mad, strange, submultiple, surd, tetched, thoughtless, touched, transcendental, ultrazealous, unadvised, unauthentic, unbalanced, unconnected, unconsidered, undiscerning, unforeseeing, ungifted, unhinged, unintellectual, unintelligent, unphilosophical, unreasonable, unreasoning, unreflecting, unreflective, unsane, unscientific, unseeing, unsensible, unsettled, unsound, untalented, unthinking, unthoughtful, unwise, wandering, wildeyed, wildlooking, without reason, witless, zealotic 
 

