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irrational    音標拼音: [ɪr'æʃənəl]
n. 無理數
a. 無理性的,不合理的

無理數無理性的,不合理的

irrational
adj 1: not consistent with or using reason; "irrational fears";
"irrational animals" [ant: {rational}]
2: real but not expressible as the quotient of two integers;
"irrational numbers" [ant: {rational}]
n 1: a real number that cannot be expressed as a rational number
[synonym: {irrational number}, {irrational}]

irrational \ir*ra"tion*al\ ([i^]r*r[a^]sh"[u^]n*al), a. [L.
irrationalis: cf. F. irrationnel. See {In-} not, and
{Rational}.]
[1913 Webster]
1. Not rational; void of reason or understanding; as, brutes
are irrational animals.
[1913 Webster]

2. Not according to reason; having no rational basis; clearly
contrary to reason; easily disproved by reasoning; absurd;
-- of assertions and beliefs. Hence, of actions: foolish;
unreasonable.
[1913 Webster PJC]

It seemed utterly irrational any longer to maintain
it. --I. Taylor.
[1913 Webster]

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}.

Syn: Absurd; foolish; preposterous; unreasonable; senseless.
See {Absurd}.
[1913 Webster]

185 Moby Thesaurus words for "irrational":
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,
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,
inconsistent, 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-contradictory,
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, unreasonable,
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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