bodoh
blockheadish
stupidy
numbskulled
simpleminded
dumbassed
dumbbutt
thick
one brick short of a full load
retardical
dumb as an ox
numbnut
bull
dumbfuckery
foppery
stupidicy
pratty
opaque
dopey
stupidass
thick as mince
stockishly
fatheadedly
baka
dym
bee-brained
shtus
pillocky
thickhead
thick as pig shit
shit-for-brains
dumb
thick as a whale omelette
dumber than a rock
dumb as dirt
dunderheaded
retarded
rock-dumb
muddlebrained
lamebrained
dumb as a stump
dumb as a post
dumbass
dumbish
sohai
chuckleheaded
flea-brained
dumb as nails
fatuitous
crackbrained
anserous
idioticy
soft
twp
fool
idiocity
goosish
dunderheadism
stockishness
tomfool
dumb as a box of rocks
dipshittery
goofball
thick as a plank
brain damage
boobery
dumber than a box of rocks
bubbleheaded
thickheadedness
nut-head
sill
dumb as a doorknob
thick as two short planks
dunderheadedness
numskullery
dumb as a bag of hammers
bull butter
bullcrap
who shot John
cockamamy
bullshittery
pigswill
twonk
boofheaded
bollocks more like
load
bullspit
bulldung
malarkey
stupidly
ball
flimflammery
arsewash
cobblers
bolloxology
bosh
dumb as a rock
doltishly
fiddle-faddle
baloney