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

• Lexulous
• Wordscraper
• Wordosaur

n. The state or quality of being irrational.

n. An irrational idea, expression, or act.

n. The quality or state of being irrational; want of the faculty or the quality of reason; fatuity.

n. Something which is irrational or brought forth by irrational action, judgement, idea or thought.

n. The quality or state of being irrational; absence of rationality.

n. The condition of being irrational; want of the faculty or the quality of reason; fatuity: as, the irrationality of brutes; the irrationality of a scheme.

n. That which is irrational; an irrational thought, action, or thing.

n. In mathematics, incommensurability.

n. the state of being irrational; lacking powers of understanding

"It seems to work best for me, by the way, when I know why a certain irrationality is there, even if I never tell the reader."

insanity   

algebraic irrationality    irrationality of dispersion   

abnormality    bisexuality    brutality    commonality    confidentiality    congeniality    criticality    dimensionality    duality    extraterritoriality   

senselessness    shiftlessness    pointlessness    inefficiency    unfairness    puerility    inanity    laziness    uselessness    improbity