The quality or state of being irrational; want of the faculty or the quality of reason; fatuity. / Something which is irrational or brought forth by irrational action, judgement, idea or thought.

A philosophical movement formed as a cultural reaction against positivism in the early 20th century.

In an irrational manner; without reason; in a manner contrary to reason

plural of irrationality

simple past tense and past participle of irrationalize

Third-person singular simple present indicative form of irrationalize

plural of irrationalism

The quality of being irrational.

(of an action or decision) Not rational. / (of a person or thing) Not possessing rationality.

(transitive) To make irrational.