demented

Etymology

Past participle of dement, from Latin dēmentāre.

adj

  1. Insane or mentally ill.
    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. August 5, 2012, 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)
  2. Suffering from dementia.
  3. (informal) Crazy; ridiculous.
    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. c. 1990, How to Play Super C (PDF) (instruction manual), Konami, page 4
    a demented idea

verb

  1. simple past and past participle of dement

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