- subnormality - the state of being less than normal (especially with respect to intelligence)
--1 is a kind of abnormality, abnormalcy, abnormal condition
- retardation, mental retardation, backwardness, slowness, subnormality - lack of normal development of intellectual capacities
--2 is a kind of stupidity
--2 has particulars:abnormality, mental defectiveness; moronity, mental deficiency; idiocy, amentia; imbecility; mongolism, mongolianism, Down's syndrome, Down syndrome, trisomy 21 - retardation, mental retardation, backwardness, slowness, subnormality - lack of normal development of intellectual capacities