'irrational' definitions:
Definition of 'irrational'
(from WordNet)
adjective
Not consistent with or using reason; "irrational fears"; "irrational animals" [ant: rational]
adjective
Real but not expressible as the quotient of two integers; "irrational numbers" [ant: rational]
noun
A real number that cannot be expressed as a rational number [syn: irrational number, irrational]
Definition of 'irrational'
From: GCIDE
- 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]
Synonyms of 'irrational'
From: Moby Thesaurus
- 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