To argue illogically or irrationally; to speak or act against reason; to dispute with faulty logic.
From dis- (negation) + reason (from Latin 'rationem', meaning reckoning or judgment). Medieval philosophers used this term to describe flawed argumentation and sophistry.
Francis Bacon warned about 'disreason' as one of the greatest obstacles to scientific progress—it's what happens when ego, tradition, or wishful thinking override logic and evidence.
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