“+ adjective
Etymology: un- (I) + reasoning, present participle of reason
1. : not reasoning ; especially : swayed by emotion that is uncontrolled by prudence or intelligence
instinctive, unreasoning as he was, entirely at the mercy of the emotion or impression which, for the moment, had seized upon him — Arthur Symons
2. : not moderated by reason : not controlled or kept in proportion by intelligence : extravangant
unreasoning terror
unreasoning prejudice
• un·rea·son·ing·ly adverb