What is "pessimists"

Usage examples of "pessimists".

Surely you can keep Treaty Controller from listening to the pessimists on Hrruba?

The optimists said that meant the Hivers were unlikely to return to that solar system again, and the pessimists wanted to know where, in that case, the sphere had gone.

But then, Keroon has experienced grave drought, and Nerat terrible torrents, and two mines in Telgar have collapsed—so the pessimists are certain that this is only the start of some tremendous calamity .

The world was divided, Landis had thought, between pessimists and optimists, those who believed that the universe's dice were loaded and those who thought that chance would just as soon throw sevens and elevens as twos or threes or twelves.

The pessimists worried about a million things that never happened— airplane accidents, fatal illnesses, robbers, doors unlocked, stoves not turned off, water left running.

With only a dozen manytappers, the primary disposition was to cast them evenly with half optimists, a quarter pessimists, and a quarter with random and foolish opinions.