> I guess the issue is that it's really difficult to draw the line between being unreasonable or even momentarily irrational and just being delusional. "The di

> I guess the issue is that it's really difficult to draw the line between being unreasonable or even momentarily irrational and just being delusional. "The distance between insanity and genius is measured only by success." - Bruce Feirstein. The only thing that "unreasonable" means is that when you tried to convince someone they should stop a certain course of action, you could not convince them and they did not refute you using logic. Mostly, the term is used as a polemic device to point out people whose axioms disagree with your own. A lot of people simply have faith in their abilities, and a priori argumentation is not even a valid way of testing whether that faith is misguided. They are irrational because Empiricism is the opposite of Rationalism.