bonehead

名词 bonehead:

1. these words are used to express a low opinion of someone's intelligence
   同义词：dunce, dunderhead, numskull, blockhead, lunkhead, hammerhead, knucklehead, loggerhead, muttonhead, shithead, dumbass, fuckhead

bone.head

n.Informal （名词）【非正式用语】
A stupid person; a dunce.
笨蛋：愚蠢的人；迟钝的学习者

【引伸】
bone.head.ed
adj.（形容词）
bone.head.edness
n.（名词）