Etymology

unreason

U1N1R1E1A1S1O1N1

Today it means: Lack of reason or rationality; unreasonableness; irrationality. Full definition →

Middle English unreson
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The story

  1. Middle English · inherited fromunreson
  2. English todayunreason

From Middle English unreson; equivalent to un- + reason.

Etymology from Wiktionary, CC BY-SA 4.0.