ir*ra"tion*al(r*rsh"n*l), a. [L. irrationalis: cf. F. irrationnel. See In- not, and Rational.]
1. Not rational; void of reason or understanding; as, brutes are
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.
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.
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Wed 19th December 2018