unreason
un·rea·son
noun
1.
the state of being irrational; lacking powers of understanding
Origin
From Middle English unreson; equivalent to un- + reason.
Related words
Word family
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.