plural pessimists
Definition of pessimist
: a person who is inclined to expect poor outcomes : someone who is given to pessimism
… such was the success of the first venture that many must now be optimistic where most were pessimists at the beginning of the year and for several years before.— Francis Byrne For pessimists, the heavens offer a host of doomsday scenarios—an asteroid crashing into Earth or deadly cosmic rays raining down on the planet.— R. Cowen
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Merriam-Webster unabridged
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Time Traveler for pessimist
The first known use of pessimist was in 1789
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