Not really Stoopid, IMHO, but blind, unable to see beyond the end of his unattractive nose, thinking (not that well!) of only himself, with not an iota of common sense or ability to recognize that someone else might, just possibly, know more than him about a particular subject. Doesn’t notice things, doesn’t learn much and doesn’t want to or see the upside of learning, does not think ahead or “realize” very much, and certainly can’t be very bright.
So, all the consequences of actions, the learning and planning that seem so very obvious to, apparently, all of us, just do not seem to even occur to what passes for a brain (it’s just soggy oatmeal, I guess) underneath that hat hair. If they do occur, they’re completely over-ridden by meeeeeeee mentality.
Same results, really, as just being that Stoopid.