irrationality JUST WRITTEN FOR YOU

/ɪˌræʃəˈnæləti/ · ir·ra·tion·al·i·ty
noun
  1. The quality or state of being irrational; lack of reason or logical consistency. The scientist noted the irrationality of the hypothesis, which ignored basic physical laws.
  2. Something that is irrational or results from irrational action, judgment, idea, or thought. His sudden purchase of the lottery ticket was an act of pure irrationality.
  3. The property of being irrational, especially in mathematics, referring to numbers that cannot be expressed as a ratio of integers. Pi's irrationality makes it impossible to write it exactly as a fraction.
Did you know? The term 'irrationality' gained prominence in psychology after Daniel Kahneman's work on cognitive biases, highlighting systematic deviations from rational decision‑making.
Written by Lexi Wordsworth, Dictionary Editor 0 lookups Added Jul 14, 2026