Retarded is a word to describe someone who is mentally slow. This is a medical word that spread to slang, and is today considered very insulting and inappropriate.

Some uses of retarded are harmless, like if you said wearing a backpack retarded or slowed down your progress on a hike. However, if you use retarded to mean stupid, you're on dangerous ground. Out of respect for people who have clinical mental retardation, this is considered an offensive term to throw around.

Definitions of retarded
  1. adjective
    relatively slow in mental or emotional or physical development
    stupid, unintelligent
    lacking intelligence
    backward, feebleminded, half-witted, slow-witted
    delayed or behind in intellectual development
    idiotic, imbecile, imbecilic
    having a mental age of three to seven years
    having a mental age of between eight and twelve years
    afflicted with cretinism
    not as far along as normal in development
    dim-witted, simple, simple-minded
    lacking mental capacity and subtlety
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    characterized by or characteristic of exceptionally early development or maturity (especially in mental aptitude)
    having the capacity for thought and reason especially to a high degree
    farther along in physical or mental development
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  2. noun
    people collectively who are mentally retarded
    synonyms: developmentally challenged, mentally retarded
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    type of:
    (plural) any group of human beings (men or women or children) collectively
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