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Definition of pessimism noun from the Oxford Advanced American Dictionary

 

pessimism

 noun
noun
NAmE//ˈpɛsəˌmɪzəm//
 
[uncountable] pessimism (about/over something)
 
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a feeling that bad things will happen and that something will not be successful; the tendency to have this feeling There is a mood of pessimism in the company about future job prospects. This widespread pessimism does not seem justified. opposite optimism
See the Oxford Advanced Learner's Dictionary entry: pessimism