fuckwittedness
retardation
boobery
dipshittery
stupidicy
dumbfuckery
foppery
wearishness
numskullery
dunderheadedness
brain damage
thickheadedness
stockishness
dunderheadism
shtus
blondeness
headslapper
bozon
stuuupid
stupids
dumb as a bag of hammers
lamebrained
bee-brained
idiotist
derp
jackassism
duuumb
stupidity
rock-dumb
dumb
retarded
dumb as dirt
thick as pig shit
mongtard
dumb as a stump
shit-for-brains
thick as a whale omelette
shitwit
opaque
muddlebrained
dumb as a post
dumber than a rock
fuckwit
booger brain
der
witless wonder
stupidly
damnfool
idiocity
blockheadish