Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun irrational

1 sense of irrational

Sense 1

irrational number, irrational -- (a real number that cannot be expressed as a rational number)

=> real number, real -- (any rational or irrational number)

Antonyms of adj irrational

2 senses of irrational

Sense 1

irrational (vs. rational) -- (not consistent with or using reason; "irrational fears"; "irrational animals")

rational (vs. irrational) -- (consistent with or based on or using reason; "rational behavior"; "a process of rational inference"; "rational thought")

=> coherent, logical, lucid -- (capable of thinking and expressing yourself in a clear and consistent manner; "a lucid thinker"; "she was more coherent than she had been just after the accident")

=> demythologized, demythologised -- (having mythical elements removed)

=> intelligent, reasoning (prenominal), thinking (prenominal) -- (endowed with the capacity to reason)

=> reasonable, sane -- (marked by sound judgment; "sane nuclear policy")

Sense 2

irrational (vs. rational) -- (real but not expressible as the quotient of two integers; "irrational numbers")

rational (vs. irrational) -- (capable of being expressed as a quotient of integers; "rational numbers")

Similarity of adj irrational

2 senses of irrational

Sense 1

irrational (vs. rational) -- (not consistent with or using reason; "irrational fears"; "irrational animals")

=> blind, unreasoning -- (not based on reason or evidence; "blind hatred"; "blind faith"; "unreasoning panic")

=> reasonless -- (not endowed with the capacity to reason; "a reasonless brute")

=> nonrational -- (not based on reason; "there is a great deal that is nonrational in modern culture")

=> superstitious -- (showing ignorance of the laws of nature and faith in magic or chance; "finally realized that the horror he felt was superstitious in origin")

Also See-> illogical#1, unlogical#1; incoherent#1; unreasonable#1

Sense 2

irrational (vs. rational) -- (real but not expressible as the quotient of two integers; "irrational numbers")