shithead
knucklehead
muttonhead
hammerhead
lunkhead
numskull
blockhead
fuckhead
dumbass
bonehead
dunderhead
loggerhead
dunce
drool bucket
cerebrally challenged
intellectually challenged
fool
divvie
monkey
submoron
dipshidiot
lackbrain
half-brained
artificial incompetence
artificial unintelligence
artificial idiocy
artificial dumbness
subnormal
folly
derp
bozon
subintellectual
der
blonde
gonk
duncify
idiot
retard
moron
buckethead
half-wit
bucket head
dimwit
cretin
changeling
you must be new here
imbecile
stun
idiotist
ignoramus
chimera
dumdum
blinkard
idiotical
stupid
asshat
crackhead
narrow artificial intelligence
tonto
dirtbrain
concrete-head
stupids
dummy
pinhead
boob
mentally challenged
shit for brains
dumbbell
duh
booby
dope
room-temperature IQ
idiotistic
bollocks
dipstick
simple
four oh four
simpleton
duuumb
cloddish
jellybrain
brainlet
gormless
not the sharpest knife in the drawer
smooth-brained
not the sharpest tool in the shed
pinheadedness
not the sharpest tool in the box
sophomania
lackwit
honyock
-head
gobemouche
ignorant
submoronic
gobe-mouche
stupidity
stupidness
fuckwad