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1. People collectively who are mentally retarded
   "he started a school for the mentally retarded";
   - retarded, developmentally challenged

1. Relatively slow in mental, emotional or physical development
   - retarded

See also: backward, cretinous, delayed, dim-witted [informal], dull-witted [archaic], feebleminded, half-witted, idiotic, imbecilic [archaic], moronic [informal], simple, simple-minded, slow-witted, stupid, unintelligent

Type of: people

Encyclopedia: Mentally retarded