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.

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

plural of irrationality

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

The quality of being irrational.

plural of irrationalism

Third-person singular simple present indicative form of irrationalize

simple past tense and past participle of irrationalize

present participle of irrationalize

(transitive) To make irrational.