retarded
boneheaded
deficient
dim-witted
dull-witted
dumb
empty-headed
exceptional
idiotic
imbecile
imbecilic
irresolute
mentally defective
moronic
simple
slow-witted
stupid
subnormal
thick
vacant
vacillating
weak-minded
witless
feeble-mindedly
feeble-mindedness
alarmist
ambivalent
asthmatic
bioplasmic
brainless
brought-up
eighth-century
excitable
goitrous
good
half-witted
ill-clad
improvident
indisposed
infirm
mystery-mongering
nasty
phthisical
psycho-therapeutic
science-fictional
shortsighted
small-brained
ulcerated
untalented