irrational

[ ih-rash-uh-nl ]

/ ɪˈræʃ ə nl /

SEE SYNONYMS FOR irrational ON THESAURUS.COM

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 relating 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.

Origin of irrational

First recorded in 1425–75; late Middle English word from Latin word irratiōnālis. See ir-², rational

SYNONYMS FOR irrational

3 unreasonable, ridiculous; insensate.

SEE SYNONYMS FOR irrational ON THESAURUS.COM

OTHER WORDS FROM irrational

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

Words nearby irrational

irradiance, irradiant, irradiate, irradiation, irradicable, irrational, irrational number, irrationalism, irrationality, irrationalize, irrawaddy

Example sentences from the Web for irrationally

According to her personal blog, “Irrationally Optimistic,” Zhang is a mother of two, living in a “double professional household.”

Yahoo’s Accused Sexual Harasser Asked Women to Wear More Skirts at Work |Olivia Nuzzi |July 14, 2014 |DAILY BEAST
The predominant school of thought holds that the markets are irrationally acting—and crashing—in response to the news.

Let’s All Please Stop Overreacting to Bernanke’s Remarks |Daniel Gross |June 20, 2013 |DAILY BEAST
The latest incident will give new life to the gossip that Trierweiler is irrationally jealous of Royal.

France’s Valerie Trierweiler Tweets Against Segolene Royal |Tracy McNicoll |June 12, 2012 |DAILY BEAST
It would be better to spend rationally now than irrationally in the heat of an election year.

Larry Summers’ Impossible Stimulus Dream |Zachary Karabell |June 14, 2011 |DAILY BEAST

It diminishes what they add to society, irrationally elevating their private lives in ways that do a disservice to them and to us.

Who Cares What Tiger Did? |Conor Friedersdorf |November 28, 2009 |DAILY BEAST
He'd presented it to an orphanage mainly because, irrationally, he'd have liked to keep it.

The Ambulance Made Two Trips |William Fitzgerald Jenkins
From this it will be seen how absurdly and irrationally different he was from the rest of us.

The Card, A Story Of Adventure In The Five Towns |Arnold Bennett
This wealth was never created because the capitalist class managed too wastefully and irrationally.

Revolution and Other Essays |Jack London
There were plenty in my room; but, irrationally, of course, none pleased me.

The Adventures of Jimmie Dale |Frank L. Packard
Merle, you must be very ill when you talk so irrationally and untruthfully.

Professor Huskins |Lettie M. Cummings

British Dictionary definitions for irrationally

irrational

/ (ɪˈræʃənəl) /

adjective

inconsistent with reason or logic; illogical; absurd

incapable of reasoning

maths

not rational
(as noun)an irrational

prosody (in Greek or Latin verse)

of or relating to a metrical irregularity, usually the occurrence of a long syllable instead of a short one
denoting a metrical foot where such an irregularity occurs

Derived forms of irrational

irrationally, adverb irrationalness, noun

Medical definitions for irrationally

irrational

[ ĭ-răsh′ə-nəl ]

adj.

Not rational; marked by a lack of accord with reason or sound judgment.

BROWSE DICTIONARY

Learning

irrational

adjective

noun

Origin of irrational

SYNONYMS FOR irrational

OTHER WORDS FROM irrational

Words nearby irrational

Example sentences from the Web for irrationally

British Dictionary definitions for irrationally

adjective

Derived forms of irrational

Medical definitions for irrationally

adj.

BROWSE DICTIONARY

Learning

irrational

adjective

noun

Origin of irrational

SYNONYMS FOR irrational

OTHER WORDS FROM irrational

Words nearby irrational

Words related to irrationally

Example sentences from the Web for irrationally

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adjective

Derived forms of irrational

Medical definitions for irrationally

adj.

British Dictionary definitions for irrationally