subnormality

nouns

the state of being less than normal (especially with respect to intelligence)
subnormality
is derived from
subnormal
is a type of (narrower)
an abnormal physical condition resulting from defective genes or developmental deficiencies
abnormalcy, abnormality
lack of normal development of intellectual capacities
backwardness, mental retardation, retardation, slowness, subnormality
is derived from
subnormal