doomsayer

noun

1. One who makes dire predictions about the future; one who predicts doom.

   “Even from the doomsayers you hear reflections of hope. Nobody wants "it" to happen. In his darkest moments, man is aware that, while he may be limited, humankind need not be.”

   “4: THE DOOMSAYERS¶ So many people have written so many books and articles forecasting doom at the end of the twentieth century that we cannot possibly do credit to all of them here.”

   “He is not a doomsayer or a conspiracy theorist. A ceramist, Mr. Kunze simply inhabits a longer view of history, one in which humans are the dinosaurs, facing down a probable extinction.”

   “Critics of the doomsayers, meanwhile, are becoming more outspoken.”