irrationalism

irrational +‎ -ism

irrationalism (countable and uncountable, plural irrationalisms)

1. A philosophical movement formed as a cultural reaction against positivism in the early 20th century.
   • 1964, Cross Currents of Psychiatry and Catholic Morality, page 351:

     Finally, with good reason, this psychology aims to be a psychology of a purely empiriological type. It is pervaded and overwhelmed on every side, however, by a pseudometaphysics of the most vulgar character, which Freud is all the less anxious to dispense iwth as he imagines he has no philosophy or metaphysics at all. I say pseudometaphysics of the most vulgar type, because it combines all the prejudices of deterministic, mechanistic scientism with all the prejudices of irrationalism.