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From retard +‎ -ed.



retarded (comparative more retarded, superlative most retarded)

  1. Delayed; delayed in development, hindered; impeded. [from 17th c.]
    • 2004, Duncan Mackay, The Observer, 8 Aug 2004:
      HGH, which was originally developed to assist children with retarded growth, is believed to be especially popular with sprinters.
  2. (psychology, now offensive, dated) Having mental retardation; mentally deficient or underdeveloped.
    • 2000, Kate Connolly, The Guardian, 19 Apr 2000:
      The European Roma Rights Centre in Budapest, which is representing the children - from the north-eastern city of Ostrava - said that the education ministry and local authorities had for decades "perpetuated a system which routinely brands disproportionate numbers of Gypsies as mentally retarded".
  3. (psychology, now offensive, dated) Specifically, having an IQ below 70. [from 19th c.]
  4. (colloquial, derogatory, offensive) Very stupid. [from 20th c.]
    • 1988, Raymond E Feist, Faerie Tale:
      Looking at Jack, Gabbie said, "What?" "That's the Troll Bridge." She groaned at the pun. "That's retarded."
  5. (physics) Designating a parameter of an electromagnetic field which is adjusted to account for the finite speed of radiation. [from 20th c.]




  1. simple past tense and past participle of retard