addlebrain
addlehead
addlepate
ass
beefhead
block
blubberhead
blunderbuss
blunderer
blunderhead
bonehead
booby
boor
botcher
bufflehead
bumbler
bungler
buzzard
cabbagehead
chowderhead
chucklehead
chump
clod
clodhead
clodhopper
clodknocker
clodpate
clodpoll
clot
clown
cod's-head
coof
cuddy
dimwit
doddypoll
dolt
dolthead
dotterel
driveler
dullard
dullhead
dumbbell
dumbhead
dummy
pillock
poor fish
pudden-head
pudding head
stupe
stupid
stupid person
babbler
disbeliever
duffer
dunce
dunderhead
hypocrite
impostor
knave
liar
lout
ninny
numskull
pedant
poltroon
prig
scamp
scoundrel
simpleton
slanderer
snob
windbag
scholar
wiseacre