subnormal

Noun
  1. A person of less than normal intelligence (synset 110689315)
    is a type of: simple, simpleton - a person lacking intelligence or common sense
Adjective
  1. Below normal or average (synset 301602284)
    "after the floods the harvests were subnormal"; "subnormal intelligence"
    referred to in: statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters
    similar to: abnormal, unnatural - not normal; not typical or usual or regular or conforming to a norm

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