The word pessimist is an concrete noun, a word for a person.
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The related abstract noun is pessimism, a state of negative expectations.
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Upset, down, sad, depressed, discontented
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irate, cheerless, sad-faced, sad, pessimistic.
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Some antonyms of the word 'hopeful' are: hopeless, unhopefull,
despairing, desperate, helpeless, lost, insoluble, pessimistic,
fearful, sad, discouraged.