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irrational

ir·ra·tion·al
I i

Transcription

    • US Pronunciation
    • US IPA
    • UK Pronunciation
    • UK IPA
    • [ih-rash-uh-nl]
    • /ɪˈræʃ ə nl/
    • /ɪˈræʃ.ən.əl/
    • US Pronunciation
    • US IPA
    • [ih-rash-uh-nl]
    • /ɪˈræʃ ə nl/

Definitions of irrational word

  • adjective irrational without the faculty of reason; deprived of reason. 1
  • adjective irrational without or deprived of normal mental clarity or sound judgment. 1
  • adjective irrational not in accordance with reason; utterly illogical: irrational arguments. 1
  • adjective irrational not endowed with the faculty of reason: irrational animals. 1
  • adjective irrational 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. 1
  • adjective irrational Algebra. (of an equation) having an unknown under a radical sign or, alternately, with a fractional exponent. 1

Information block about the term

Origin of irrational

First appearance:

before 1425
One of the 25% oldest English words
First recorded in 1425-75; late Middle English word from Latin word irratiōnālis. See ir-2, rational

Historical Comparancy

Parts of speech for Irrational

noun
adjective
verb
adverb
pronoun
preposition
conjunction
determiner
exclamation

irrational popularity

A common word. It’s meaning is known to most children of preschool age. About 77% of English native speakers know the meaning and use the word.
Most Europeans know this English word. The frequency of it’s usage is somewhere between "mom" and "screwdriver".

irrational usage trend in Literature

This diagram is provided by Google Ngram Viewer

Synonyms for irrational

adj irrational

  • insane — not sane; not of sound mind; mentally deranged.
  • crazy — If you describe someone or something as crazy, you think they are very foolish or strange.
  • stupid — lacking ordinary quickness and keenness of mind; dull.
  • incoherent — without logical or meaningful connection; disjointed; rambling: an incoherent sentence.
  • unreasonable — not reasonable or rational; acting at variance with or contrary to reason; not guided by reason or sound judgment; irrational: an unreasonable person.

adjective irrational

  • illogical — not logical; contrary to or disregardful of the rules of logic; unreasoning: an illogical reply.
  • unfounded — without foundation; not based on fact, realistic considerations, or the like: unfounded suspicions.
  • senseless — destitute or deprived of sensation; unconscious.
  • groundless — without rational basis: groundless fears.
  • baseless — If you describe an accusation, rumour, or report as baseless, you mean that it is not true and is not based on facts.

adverb irrational

  • brutish — If you describe a person or their behaviour as brutish, you think that they are brutal and uncivilised.
  • ferine — feral1 .
  • beastly — If you describe something as beastly, you mean that it is very unpleasant.
  • swinish — like or befitting swine; hoggish.

Antonyms for irrational

adj irrational

  • rational — agreeable to reason; reasonable; sensible: a rational plan for economic development.
  • sane — free from mental derangement; having a sound, healthy mind: a sane person.
  • sensible — having, using, or showing good sense or sound judgment: a sensible young woman.
  • logical — according to or agreeing with the principles of logic: a logical inference.
  • wise — having the power of discerning and judging properly as to what is true or right; possessing discernment, judgment, or discretion.

Top questions with irrational

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See also

Matching words

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