(noun) A person who expects a favourable outcome
"No pessimist ever discovered the secret of the stars or sailed an uncharted land, or opened a new doorway for the human spirit."
"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."
"If I regarded my life from the point of view of the pessimist, I should be undone."