subnormal

nouns

a person of less than normal intelligence
is a type of (narrower)
a person lacking intelligence or common sense

adjectives

below normal or average
"after the floods the harvests were subnormal"; "subnormal intelligence"
is derived from
is derived from
is similar to
not normal; not typical or usual or regular or conforming to a norm
"abnormal powers of concentration"; "abnormal amounts of rain"; "abnormal circumstances"; "an abnormal interest in food"
domain category
a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters