Part of speech: adjective

Deprived of reason; insane; imbecile.

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Usage examples "demented":

  1. Think me demented- it's your right; but don't tell anybody why." - "Embarrassments", Henry James.
  2. To Paul the room seemed demented because there was dust on the books and because the basket full of torn paper had not been emptied. - "The Twilight of the Souls", Louis Couperus.
  3. Domestic cattle and horses often eat this plant; where it is abundant, and become demented in consequence. - "The Extermination of the American Bison", William T. Hornaday.