knuckleheadUSinformal
numskullinformal
SMART Vocabulary: related words and phrases
Stupid and silly people
airhead
berk
birdbrain
blithering idiot
blockhead
dullard
dumb-ass
dummy
dunce
eejit
mutt
need
need your head examinedidiom
nimrod
nincompoop
simpleton
stupid
thicko
tosser
troglodyte
Am I such a dunderhead that I haven't made that plain?
Do you mean to say you were such a pack of dunderheads you didn't see it coming?
It is particularly unpleasant to hear a bullet come singing and booming down the line from some excited dunderhead on the far left or right.
The lazy dunderhead, I'll soon fix him!
You're the stupidest dunderhead I ever saw or ever heard of, so help me Moses!