arrested
backward
blithering
bubbling
burbling
crackbrained
cracked
crazy
cretinistic
cretinous
delirious
dithering
dizzy
driveling
drooling
giddy
guggling
gurgling
half-baked
half-witted
idiotic
imbecile
imbecilic
incoherent
lapping
lightheaded
maundering
mentally defective
mentally deficient
mentally handicapped
mentally retarded
mongoloid
moronic
not all there
off
plashing
rambling
ranting
raving
retarded
rippling
simple
simpleminded
simpletonian
slobbering
sloshing
splashing
subnormal
swishing
trilling
gibber
gibberish
asininity
babble
brag
chatter
clamor
gabble
giggle
jabbering
perambulation
prattle
ramblings
rhapsody
scrawl
singsong
spectrotemporal
viniculture
dabbling