unreason

[ uhn-ree-zuh n ]

/ ʌnˈri zən /

inability or unwillingness to think or act rationally, reasonably, or sensibly; irrationality.

lack of reason or sanity; madness; confusion; disorder; chaos: a world torn by unreason.

to upset or disrupt the reason or sanity of: The devious plot soon unreasoned the general.

Origin of unreason

First recorded in 1250–1300, unreason is from the Middle English word un-reson. See un-¹, reason

In The Embrace of Unreason, Frederick Brown weaves a warning for America from the story of the divided French.

‘The Embrace of Unreason’: How France Lost It All Between the Wars |Michael Korda |May 4, 2014 |DAILY BEAST
It is that phenomenon that Frederick Brown explores in his brilliant new book, The Embrace of Unreason: France, 1914-1940.

‘The Embrace of Unreason’: How France Lost It All Between the Wars |Michael Korda |May 4, 2014 |DAILY BEAST
Like the Furies, the Cheneys stand for unreason and emotionalism.

Cheney Blood Lust |Lee Siegel |October 22, 2009 |DAILY BEAST
There were not only doubt and denial, but now there were also impatience and unreason.

Soul of a Bishop |H. G. Wells

The more he believes in his own reason, the more he yearns for some method of out-shouting the unreason of his neighbours.

God and Mr. Wells |William Archer
The unreason of our painting has the same cause as the unreason of our objects of use; and the cause is in us, not in the artist.

Essays on Art |A. Clutton-Brock
He felt as if he had been assaulting a beautiful alabaster wall of unreason.

The Portion of Labor |Mary E. Wilkins Freeman
God torments himself with the devil, and the philosopher does it with unreason and the accidental.

The Ego and His Own |Max Stirner

unreason

/ (ʌnˈriːzən) /

irrationality or madness

something that lacks or is contrary to reason

lack of order; chaos

(tr) to deprive of reason