imbecile

Noun
  1. A person of subnormal intelligence (synset 110217144)
    is a type of: simple, simpleton - a person lacking intelligence or common sense
    subtypes: mongoloid - a person suffering from Down syndrome (no longer used technically in this sense, now considered offensive)
    same as: changeling, cretin, half-wit, idiot, moron, retard
Adjective
  1. Having a mental age of three to seven years (synset 301846795)
    similar to: retarded - relatively slow in mental or emotional or physical development
    same as: idiotic, imbecilic

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