irrational

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ir·ra·tion·al

 (ĭ-răsh′ə-nəl)
adj.
1.
a. Not endowed with reason.
b. Affected by loss of usual or normal mental clarity; incoherent, as from shock.
c. Marked by a lack of accord with reason or sound judgment: an irrational dislike.
2.
a. Being a syllable in Greek and Latin prosody whose length does not fit the metric pattern.
b. Being a metric foot containing such a syllable.
3. Mathematics Of or relating to an irrational number.
n. Mathematics
An irrational number.

ir·ra′tion·al·ly adv.
ir·ra′tion·al·ness n.

irrational

(ɪˈræʃənəl)
adj
1. inconsistent with reason or logic; illogical; absurd
2. incapable of reasoning
3. (Mathematics) maths
a. not rational
b. (as noun): an irrational.
4. (Poetry) prosody (in Greek or Latin verse)
a. of or relating to a metrical irregularity, usually the occurrence of a long syllable instead of a short one
b. denoting a metrical foot where such an irregularity occurs
irˈrationally adv
irˈrationalness n

ir•ra•tion•al

(ɪˈræʃ ə nl)

adj.
1. lacking the faculty of reason; deprived of reason.
2. lacking sound judgment or logic: irrational arguments.
3. not controlled or governed by reason: irrational behavior.
4.
a. (of a number) not capable of being expressed exactly as a ratio of two integers.
b. (of a function) not capable of being expressed exactly as a ratio of two polynomials.
c. (of an equation) having an unknown under a radical sign or, alternately, with a fractional exponent.
5. of or pertaining to a syllable in Greek or Latin prosody whose quantity does not fit the meter.
n.
[1425–75; late Middle English < Latin]
ir•ra′tion•al•ly, adv.
ir•ra′tion•al•ness, n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.irrational - a real number that cannot be expressed as a rational number
real, real number - any rational or irrational number
transcendental number - an irrational number that is not algebraic
algebraic number - root of an algebraic equation with rational coefficients
Adj.1.irrational - not consistent with or using reason; "irrational fears"; "irrational animals"
incoherent - without logical or meaningful connection; "a turgid incoherent presentation"
illogical, unlogical - lacking in correct logical relation
unreasonable - not reasonable; not showing good judgment
rational - consistent with or based on or using reason; "rational behavior"; "a process of rational inference"; "rational thought"
2.irrational - real but not expressible as the quotient of two integers; "irrational numbers"
math, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
rational - capable of being expressed as a quotient of integers; "rational numbers"

irrational

adjective
2. senseless, wild, crazy, unstable, insane, mindless, demented, aberrant, brainless They behaved in such a bizarre and irrational manner.

irrational

adjective
Not governed by or predicated on reason:
Translations
iracionální
epälooginenirrationaalinen

irrational

[ɪˈræʃənl] ADJ [behaviour, person, belief] → irracional

irrational

[ɪˈræʃənəl] adj
[feeling, behaviour, idea, belief] → irrationnel(le)
an irrational fear of science → une peur irrationnelle de la science
[argument] → irrationnel(le)
to be irrational → être irrationnel

irrational

adj
(= illogical, also Math, Psych) → irrational; fear, beliefunsinnig, irrational; (= not sensible)unvernünftig; he had become quite irrational about iter hatte eine irrationale Einstellung dazu entwickelt; if you maintain X, then it is irrational to deny Ywenn Sie X behaupten, ist es widersinnig or unlogisch, Y zu leugnen
(= not having reason) animalvernunftlos

irrational

[ɪˈræʃənl] adjirrazionale
an irrational fear → una paura irrazionale
he had become quite irrational about it → era diventato piuttosto irragionevole al riguardo

ir·ra·tion·al

n. irracional.