Just a bit worse than stupid.
when something is just so dumb and lacking any common sense that "stupid" just doesnt seem to cut it. It can be summed up as "stoopid".
"... this is just so, so, dumb, i cant even begin to describe it...."
Man, that blindfolded, triple somersault on one rollerblade while holding a bowling ball was one stoopid stunt.
-or-
Standing up to your boss and telling him he's a pansy if he doesn't give you a raise - now that's scary stoopid.