# unreason

> English word · Noun

## Definitions
1. Lack of reason or rationality; unreasonableness; irrationality.
2. Nonsense; folly; absurdity.

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

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/unreason