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by komadori 671 days ago
Moron, Idiot, and Imbecile were coined as precise medical terms by Dr Henry H Goddard in the 1900-10s. Retard(ed) was devised as a euphemism to replace them in the 1960s.

Once an unfashionable euphemism falls out of use, people gradually cease to recognise the offensive meaning which made it unfashionable.