UNREASONING
blind, unreasoning
(adjective) not based on reason or evidence; “blind hatred”; “blind faith”; “unreasoning panic”
Source: WordNet® 3.1
Etymology
Adjective
unreasoning (comparative more unreasoning, superlative most unreasoning)
Behaving without reason.
Source: Wiktionary
UNREASON
Un*rea"son, n. Etym: [Pref. un- not + reason.]
Definition: Want of reason; unreasonableness; absurdity. Abbot of Unreason.
See Abbot of Misrule, under Abbot.
Un*rea"son, v. t. Etym: [1st pref. un- + reason.]
Definition: To undo, disprove, or refute by reasoning. [Obs.]
To unreason the equity of God's proceedings. South.
Source: Webster’s Unabridged Dictionary 1913 Edition