[ ih-rash-uh-nl-iz-uh m ]
/ ɪˈræʃ ə nlˌɪz əm /


irrationality in thought or action.
an attitude or belief having a nonrational basis.
a theory that nonrational forces govern the universe.

Origin of irrationalism

First recorded in 1805–15; irrational + -ism
Related formsir·ra·tion·al·ist, adjective, nounir·ra·tion·al·is·tic, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for irrationalism

  • Classical empiricism results in irrationalism; perhaps it would even be fitting to designate it by this latter name.

  • His contention that they cannot be reasoned about has led to the further charge of irrationalism.

    Rudolph Eucken|Abel J. Jones
  • Thus the objection of "irrationalism" directed against the new philosophy falls to the ground.