(noun) A person who expects a favourable outcome
"If I regarded my life from the point of view of the pessimist, I should be undone."
"A stumbling block to the pessimist is a stepping-stone to the optimist."
"Both optimists and pessimists contribute to society. The optimist invents the aeroplane, the pessimist the parachute."
"No pessimist ever discovered the secret of the stars or sailed an uncharted land, or opened a new doorway for the human spirit."