bonehead
One who is regarded as dumb, stupid, or obstinate. Is he really pulling a door that's clearly marked "push"? What a bonehead. OK, which one of you boneheads jammed this paper in the printer? Come on, bonehead, I've shown you how to do it five times now!
boneheaded
Dumb, stupid, or obstinate. Looks like I'm pulling on a door that's clearly marked "push"—what a boneheaded thing to do! A: "I can't believe you put a pizza in the oven for 30 minutes without first turning it on." B: "Yeah, that was pretty boneheaded of me." Well, that was boneheaded—I went all the way down to that restaurant, only to be reminded that they are closed on Mondays.
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