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Insane vs Irrational - What's the difference?

insane | irrational | Related terms |

As adjectives the difference between insane and irrational

is that insane is exhibiting unsoundness or disorder of mind; not sane; mad; deranged in mind; delirious; distracted while irrational is not rational; unfounded or nonsensical.

As a noun irrational is

a real number that can not be expressed as the quotient of two integers, an irrational number.

insane

English

Adjective

(en adjective)
  • Exhibiting unsoundness or disorder of mind; not sane; mad; deranged in mind; delirious; distracted.
  • * '>citation
    • What is the cause of insanity?
    Nobody can answer such a sweeping question as that,
    but we know that certain diseases, such as syphilis, break
    down and destroy the brain cells and result in insanity. In
    fact, about one-half of all mental diseases can be attributed
    to such physical causes as brain lesions, alcohol, toxins,
    and injuries. But the other half—and this is the appalling
    part of the story—the other half of the people who go in-
    sane' apparently have nothing organically wrong with
    their brain cells. In post-mortem examinations, when their
    brain tissues are studied under the highest-powered micro-
    scopes, they are found to be apparently just as healthy as
    yours and mine.
    Why do these people go '     insane     ?
  • Used by, or appropriated to, insane persons; as, an insane hospital.
  • Causing insanity or madness.
  • Characterized by insanity or the utmost folly; chimerical; unpractical; as, an insane plan, attempt, etc.
  • * , chapter=16
    • , title= The Mirror and the Lamp , passage=The preposterous altruism too!

    Synonyms

    * See also

    Antonyms

    * sane

    Related terms

    * insanity

    External links

    * * *

    Anagrams

    * ----

    irrational

    English

    Adjective

    (en adjective)
  • Not rational; unfounded or nonsensical.
    • an irrational decision
  • * July 18 2012 , Scott Tobias, AV Club The Dark Knight Rises [http://www.avclub.com/articles/the-dark-knight-rises-review-batman,82624/]
    • Where the Joker preys on our fears of random, irrational acts of terror, Bane has an all-consuming, dictatorial agenda that’s more stable and permanent, a New World Order that’s been planned out with the precision of a military coup.
  • (mathematics, arithmetic, number theory, not comparable) Of a real number, that cannot be written as the ratio of two integers.
    • The number π is irrational .

    Antonyms

    * (mathematics) rational

    Hyponyms

    * (mathematics) transcendental

    Derived terms

    * irrational number * irrationality * irrationalize * irrationalization

    Noun

    (en noun)
  • A real number that can not be expressed as the quotient of two integers, an irrational number.
  • * 1946 , (Bertrand Russell), History of Western Philosophy , I.24:
    • The square root of 2, which was the first irrational to be discovered, was known to the early Pythagoreans, and ingenious methods of approximating to its value were discovered.