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Pessimism is a human mindset, which tends to only see the negative things in life. A pessimistic person will tend to expect and assume the worst, having a "glass half-empty" personality. Pessimism is very often the cause of depression.[1]

However, a small amount of pessimism can be beneficial, such as avoiding scams with the "if it seems too good to be true, it probably is" adage.


  1. Learned Optimism by Martin E.P. Seligman, Ph.D.