numbskulled
simpleminded
dumbassed
retardical
dumb as an ox
thick
numbnut
bull
one brick short of a full load
dumbbutt
bodoh
stupidy
blockheadish
dumbfuckery
foppery
stupidicy
dopey
baka
opaque
thickhead
dumbish
pratty
stupidass
thick as mince
dumb as a box of rocks
dumber than a box of rocks
dumb as a doorknob
thick as a plank
thick as two short planks
dunderheaded
retarded
thick as a whale omelette
thick as pig shit
dumber than a rock
dumb
dumb as dirt
shit-for-brains
dumbass
muddlebrained
rock-dumb
dumb as a post
dumb as a stump
sill
dumb as a bag of hammers
goofball
who shot John
twonk
lamebrained
dym
load