Dumbhead - Idioms by The Free Dictionary
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Someone who is very stupid. Can you believe that dumbhead is still pushing the door marked "pull"?
n. a stupid person. Bob is no dumbhead, but he sure is strange.
References in periodicals archive
And even though this is a district with a lot of gay voters, Kennedy was in some cases a real dumbhead
on our issues.
In understanding Chekhov, don't be dumbheads
," she warns.