noun
a person who is inclined to view or describe things in a negative or pessimistic way
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The critic was often labeled as a miserabilist for his pessimistic views on contemporary art.
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Don't be such a miserabilist, try to see the positive side of things.
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Stop being a miserabilist and lighten up a bit.
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Her outlook on life was so gloomy, it was as if she had embraced being a miserabilist.