irrational

irrational is an   Adverb

Definition:

[1] Not rational; void of reason or understanding; as, brutes are irrational animals.

[2] Not according to reason; absurd; foolish. It seemed utterly irrational any longer to maintain it. I. Taylor.

[3] Not capable of being exactly expressed by an integral number, or by a vulgar fraction; surd; -- said especially of roots. See Surd.

Synonyms: