demented

adjective3

1. •
   Insane; mentally ill.

   • 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. — 2026
2. •
   (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. — 1990
3. •
   Having dementia.