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Past participle of dement, from Latin dēmentāre.



demented (comparative more demented, superlative most demented)

  1. Insane or mentally ill.
    • 2012 August 5, Nathan Rabin, “TV: Review: THE SIMPSONS (CLASSIC): “I Love Lisa” (season 4, episode 15; originally aired 02/11/1993)”, in (Please provide the book title or journal name)[1]:
      So while Ralph generally seems to inhabit a different, more glorious and joyful universe than everyone else here his yearning and heartbreak are eminently relateable. Ralph sometimes appears to be a magically demented sprite who has assumed the form of a boy, but he’s never been more poignantly, nakedly, movingly human than he is here.
  2. Suffering from dementia.
  3. (informal) Crazy; ridiculous.
    • c. 1990, How to Play Super C (PDF) (instruction manual), Konami, page 4:
      One of these new recruits is Jagger Froid, a demented alien from the Black Hole Galaxy, who dishes out punishment with a laser-sharp tongue.
    a demented idea




  1. simple past tense and past participle of dement

See also[edit]