different between irrational vs crazy

English

Etymology

From Latin irrati?n?lis, from ir- + rati?n?lis.

Pronunciation

• enPR: ?r?'sh(?)n?l, IPA^(key): /???æ?.(?.)n?l/

Adjective

irrational (comparative more irrational, superlative most irrational)

1. Not rational; unfounded or nonsensical.
   • July 18, 2012, Scott Tobias, AV Club The Dark Knight Rises[1]

     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.

2. (mathematics, arithmetic, number theory, not comparable) Of a real number, that cannot be written as the ratio of two integers.

   Antonym: rational

   Hyponym: transcendental

Derived terms

Translations

Noun

irrational (plural irrationals)

1. 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.

Translations

German

Alternative forms

• irrationell

Pronunciation

• IPA^(key): /???at?si?ona?l/, /??at?si?o?na?l/

Adjective

irrational (comparative irrationaler, superlative am irrationalsten)

1. irrational

Declension

English

Etymology

From craze +? -y.

Pronunciation

• IPA^(key): /?k?e?zi/
• Rhymes: -e?zi

Adjective

crazy (comparative crazier, superlative craziest)

1. (obsolete) Flawed or damaged; unsound, liable to break apart; ramshackle. [16th–19th c.]
   • 1789, John Moore, Zeluco, Valancourt 2008, p. 203:

     Buchanan shewed her into a room adjoining to Mr. Steele's dressing-room, and separated from it by a very crazy partition.

   • 1816, Francis Jeffrey, "Memoirs of Madame de Larochejaquelein", in The Edinburgh Review February 1816

     They […] got a crazy boat to carry them to the island.
2. (obsolete) Sickly, frail; diseased. [16th–19th c.]
   • 1663, Samuel Butler, Hudibras

     Over moist and crazy brains.

   • One of great riches, but a crazy constitution.

   • c. 1793, Edward Gibbon, Memoirs, Penguin 1990, p. 61:

     My poor aunt has often told me […] how long she herself was apprehensive lest my crazy frame, which is now of common shape, should remain for ever crooked and deformed.

3. Of unsound mind; insane, demented. [from 17th c.]

4. Out of control.

5. Very excited or enthusiastic.
   • 1864, R. B. Kimball, Was He Successful?

     The girls were crazy to be introduced to him.

6. In love; experiencing romantic feelings.

7. (informal) Very unexpected; wildly surprising.

Synonyms

• Thesaurus:insane
• (out of control): off the chain, nutso
• (insane; lunatic; demented): deranged, loco, nutso, zany

Derived terms

Translations

Adverb

crazy (comparative more crazy, superlative most crazy)

1. (slang) Very, extremely.

Translations

Noun

crazy (countable and uncountable, plural crazies)

1. An insane or eccentric person; a crackpot.
   • 2011 Allen Gregory, "Pilot" (season 1, episode 1):

     Allen Gregory DeLongpre: Now drink up, you knuckleheads! Have a blast! It's our night, you crazies! Chloe, where are you?

2. (slang, uncountable) Eccentric behaviour; lunacy.

Synonyms

• (insane or eccentric person): lunatic, mad man, nut ball, nut case, nutso, psychopath

Translations

See also

• crazy on Wikipedia.Wikipedia