This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Someone who given a choice of outcomes, believes the worst is more likely.

n. One who advocates the doctrine of pessimism; -- opposed to optimist.

n. One who looks on the dark side of things.

adj. Of or pertaining to pessimism; characterized by pessimism; gloomy; foreboding.

n. One who accepts the metaphysical doctrine of pessimism, in either sense.

n. One who exaggerates the evils of life or is disposed to see only its dark side; one who is given to melancholy or depressing views of life.

Same as pessimistic.

n. a person who expects the worst

"In popular language the term pessimist is applied to persons who habitually take a melancholy view of life, to whom painful experiences appeal with great intensity, and who have little corresponding appreciation of pleasurable ones."

pessimistic   

optimist   

sceptic    skeptic    doubter   

bear    pessimistic    pessimism   

negativist    defeatist   

gloomy    foreboding    cynic    malist    miserabilist   

idealist    optimist    cynic    doubter    formalist    skeptics    optimists    skeptic    agnostic    reactionist