demented

adj

1. Insane; 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.”

   “In the past week, he [Donald Trump] attacked the “truly sick and demented people” in the news media, […], not even counting the “deranged scumbags” in Iran.”

2. Having dementia.
3. (informal)Crazy; ridiculous.

   “a demented idea”

   “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.”

   “Literally nothing happens, apart from Donaldson counting to 100,000. In this sense, it is nothing like his later videos, defined as they are by a near-demented commitment to maximum viewer-stimulation.”

verb

1. (form-of, participle, past)simple past and past participle of dement