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Definition of pessimist : 1. Alt. of Pessimistic
2. One who advocates the doctrine of pessimism; - opposed to optimist.
3. One who looks on the dark side of things.

Synonyms:

complainer, doomsayer, depreciator, realist, gloomy Gus, melancholic, hope, worrier, misanthrope, worrywart, Cassandra, crepehanger, croaker

unbeliever (part of speech: noun)

atheist, skeptic, dissenter, heretic, doubter, doubting Thomas, unbeliever, infidel, heathen, nonbeliever, agnostic, cynic, disbeliever

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