01 a. Not rational; void of reason or understanding; as, brutes are irrational animals.
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1.
Not rational; void of reason or understanding; as, brutes are irrational animals.
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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.
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3.
Not capable of being exactly expressed by an integral number, nor by a ratio of integral numbers; surd; -- said especially of roots. See Surd.(Math.) See: Surd
Syn.
Absurd; foolish; preposterous; unreasonable; senseless. See Absurd.