mental defectiveness
abnormality
room-temperature IQ
nonreceptivity
brainpower
retardancy
subnormality
moronity
intellectual disability
mental deficiency
subnormal
nimbleness
mental dexterity
not the sharpest knife in the drawer
not the sharpest tool in the shed
noetic
not the sharpest tool in the box
retardation
feeblemindedness
sophomania
mental age
stupidass
unintelligence
retardate
developmental disability
vacancy
dysrationalia
obtundation
quick-wittedness
mental quickness
quickness
failure
sleep
hyporesponsiveness
loss of consciousness
idiot savant
deacceleration
enough sense to pound sand into a rathole
discerptibleness
simple
imbecility
capacity
simpleton
fluctuability
nonretraction
retardedness
subfunctioning
induplication
noesis