Irrational vs Foolish - What's the difference?

irrational | foolish | Related terms |

Irrational is a related term of foolish.

As adjectives the difference between irrational and foolish

is that irrational is not rational; unfounded or nonsensical while foolish is lacking good sense or judgement; unwise.

As a noun irrational

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




(en adjective)
  • Not rational; unfounded or nonsensical.
  • an irrational decision
  • * July 18 2012 , Scott Tobias, AV Club The Dark Knight Rises [,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 .


    * (mathematics) rational


    * (mathematics) transcendental

    Derived terms

    * irrational number * irrationality * irrationalize * irrationalization


    (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.




  • Lacking good sense or judgement; unwise.
  • :
  • *
  • *:As a political system democracy seems to me extraordinarily foolish , but I would not go out of my way to protest against it. My servant is, so far as I am concerned, welcome to as many votes as he can get. I would very gladly make mine over to him if I could.
  • Resembling or characteristic of a fool.
  • :
  • *(Aeschylus)
  • *:It is a profitable thing, if one is wise, to seem foolish .
  • Synonyms

    * absurd * idiotic * ridiculous * silly * unwise


    * wise

    Derived terms

    * foolishness