>you have ever questioned your own intellectual abilities
That's not quite fair. People are obtuse about this shit, too, anyway. If you're so obviously smarter than everyone around you that you'd legit have to be posturing dishonestly in order to pretend you weren't sure of it, that's Dunning-Kruger, but if you *do* question your own intellectual capacity, that's *also* because you're retarded. Self-assured because you truly never encounter intellectual difficulty? Dunning-kruger, you're stupid. A little more humble because you appreciate how complicated things really are? Nah, you're stupid or it'd be easy for you. Not that you'd be allowed to express how easy it was, or else you'd be a dunning-kruger dummy, only showing how out-of-his-depth he is.
Brilliant people are simultaneously so bright that it's impossible for average and comparatively imperceptive people to ignore or mistake it, and completely oblivious to that fact throughout their entire lives despite everyone blowing smoke up their ass for it constantly.