Webster's Revised Unabridged Dictionary · 1913

Unreason

Unreason , noun

[Prefix un- not + reason.]

Want of reason; unreasonableness; absurdity.
Collocations (1)
Abbot of Unreason , See Abbot of Misrule, under Abbot.

Unreason , transitive verb

[1st pref. un- + reason.]

To undo, disprove, or refute by reasoning. [Obsolete]
To unreason the equity of God's proceedings. — South