This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Irrational thought, expression, or behavior; irrationality.

n. Belief in feeling, instinct, or other nonrational forces rather than reason.

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

n. The principles of a system of thought opposed to rationalism; irrationality; the quality of not being guided by reason.

"For a bird's-eye view of the history of the idea of irrationalism in philosophy, two preliminary method - ological observations are in order."

nominalism    objectivism    fortun    monachism    water cure