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verb (used with object), ir·ra·tion·al·ized, ir·ra·tion·al·iz·ing.
  1. to make or cause to be irrational.
Also especially British, ir·ra·tion·al·ise.

Origin of irrationalize

First recorded in 1890–95; irrational + -ize
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for irrationalize

Historical Examples

  • The poor man wants to rationalize the irrational, and irrationalize the rational.

    Rosinante to the Road Again

    John Dos Passos

  • And he wishes, unhappy man, to rationalize the irrational and irrationalize the rational.

    Tragic Sense Of Life

    Miguel de Unamuno