more irrational

adjective

without the faculty of reason; deprived of reason.

without or deprived of normal mental clarity or sound judgment.

not in accordance with reason; utterly illogical: irrational arguments.

not endowed with the faculty of reason: irrational animals.

Mathematics.

(of a number) not capable of being expressed exactly as a ratio of two integers.

(of a function) not capable of being expressed exactly as a ratio of two polynomials.

Algebra. (of an equation) having an unknown under a radical sign or, alternately, with a fractional exponent.

Greek and Latin Prosody.

of or pertaining to a substitution in the normal metrical pattern, especially a long syllable for a short one.

noting a foot or meter containing such a substitution.

noun

Mathematics, irrational number.

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Origin:
1425–75; late Middle English < Latin irratiōnālis. See ir-², rational

Related forms

ir·ra·tion·al·ly, adverb

ir·ra·tion·al·ness, noun

non·ir·ra·tion·al, adjective, noun

non·ir·ra·tion·al·ly, adverb

non·ir·ra·tion·al·ness, noun

Synonyms
3. unreasonable, ridiculous; insensate.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins

World English Dictionary

irrational (ɪˈræʃən^əl)

—*adj*
1.	inconsistent with reason or logic; illogical; absurd
2.	incapable of reasoning
3.	maths
	a. not rational
	b. (as noun): an irrational
4.	in Greek or Latin verse prosody
	a. of or relating to a metrical irregularity, usually the occurrence of a long syllable instead of a short one
	b. denoting a metrical foot where such an irregularity occurs

ir'rationally

—*adv*

ir'rationalness

—n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline

Word Origin & History

irrational

c.1470, "not endowed with reason" (of beats, etc.), from L. irrationalis "without reason," from in- "not" + rationalis "reason" (see reason). Meaning "illogical, absurd" is attested from 1641.

American Heritage

Medical Dictionary

irrational ir·ra·tion·al (ĭ-rāsh'ə-nəl)
adj.
Not rational; marked by a lack of accord with reason or sound judgment.

Matching Quote

"Life, from beginning to end, is fear. Yes, it is pain, yes, it is desire, but more than anything it is fear; a certain amount rational, an enormous amount irrational. All political cruelties stem from that overwhelming fear. To push back the threatening forces, to offer primitive sacrifices, to give up some in the hope that others will be saved ... that is the power struggle. That is the outsidedness of the poor, the feeble, the infantile. That is the outsidedness of Jews. That is the outsidedness of blacks. That is the outsidedness of women."

-Vivian Gornick

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