It is the attitude of mind  and a way to look at life. pessimists speak negatively like they say a glass is half empty and not half full . optimists see positive thing.pessimists say that the world is a worst place etc etc

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A tendency to see the worst aspect of things or believe that the worst will happen:
                   EXAMPLE  "the dispute cast an air of deep pessimism over the future of the peace talks"

synonyms: defeatism · negative thinking · negativity ·
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