a. | 1. | |
1. | Not rational; void of reason or understanding; | |
2. | Not according to reason; having no rational basis; clearly contrary to reason; easily disproved by reasoning; absurd; - of assertions and beliefs. | |
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. |
Adj. | 1. | irrational - not consistent with or using reason; "irrational fears"; "irrational animals" Antonyms: 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" Antonyms: rational - capable of being expressed as a quotient of integers; "rational numbers" |