unreason Meaning, Definition & Usage

  1. noun the state of being irrational; lacking powers of understanding
    irrationality.

WordNet

Un*rea"son noun
Etymology
Pref. un- not + reason.
Definitions
  1. Want of reason; unreasonableness; absurdity.
Un*rea"son transitive verb
Etymology
1st pref. un- + reason.
Definitions
  1. To undo, disprove, or refute by reasoning. Obs.
    To unreason the equity of God's proceedings. South.

Webster 1913