absolute
arrested
babbling
backward
blasted
blessed
burbling
crackbrained
cracked
crazy
cretinistic
cretinous
dithering
downright
driveling
drooling
gross
half-baked
half-witted
idiotic
imbecile
imbecilic
jabbering
maundering
mentally defective
mentally deficient
mentally handicapped
mentally retarded
mongoloid
moronic
not all there
out-and-out
outright
positive
rank
retarded
simple
simpleminded
simpletonian
slobbering
subnormal