retarded

1. Relatively slow in mental or emotional or physical development (synset 301846281)
   "providing a secure and sometimes happy life for the retarded"
   also: stupid, unintelligent - lacking intelligence
   similar to:

   • backward, feebleminded, half-witted, slow-witted - retarded in intellectual development
   • idiotic, imbecile, imbecilic - having a mental age of three to seven years
   • moronic - having a mental age of between eight and twelve years
   • cretinous - afflicted with cretinism
   • delayed - not as far along as normal in development
   • dim-witted, simple, simple-minded - lacking mental capacity and subtlety

1. People collectively who are mentally retarded (synset 107965557)
   "he started a school for the retarded"
   is a type of: people - (plural) any group of human beings (men or women or children) collectively
   same as: developmentally challenged, mentally retarded

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