halfwit
stupidass
stun
dirtbrain
idiot
simple
simpleton
underbrained
mentally challenged
dimwit
subnormal
stupid
not the sharpest tool in the box
fool
not the sharpest tool in the shed
lackluster
not the sharpest knife in the drawer
birdbrain
unintelligence
half-witted
divvie
unintelligent
half-brained
drool bucket
simple-mindedly
nonintellectual
nonintelligent
vacancy
no-name
cretin
retard
imbecile
half-wit
changeling
moron
dull
lackbrain
peon
unbright
subintellectual
four oh four
overstater
dim
cerebrally challenged
intellectually challenged
maladroit
submoron
debutard
gormless
vacuous