Definitions from Wiktionary (retarded)

▸ adjective:  Delayed; delayed in development, hindered; impeded.
▸ adjective:  (psychology, sometimes offensive, dated) Having mental retardation; mentally deficient or underdeveloped.
▸ adjective:  (psychology, sometimes offensive, dated) Specifically, having an IQ below 70.
▸ adjective:  (colloquial, derogatory, offensive) Extremely stupid; obtuse
▸ adjective:  (physics) Designating a parameter of an electromagnetic field which is adjusted to account for the finite speed of radiation.
▸ Also see retarded

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