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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Sadness is an emotion characterized by feelings of disadvantage, loss, and helplessness. When sad, people often become quiet, less energetic, and withdrawn. Sad is the negation of happy. Its synonyms are sorrow, grief, misery, and melancholy. The philosopher Baruch Spinoza defined sadness as the transfer of a person from a large perfection to a smaller one. Sadness can be viewed as a temporary lowering of mood, whereas depression is characterized by a persistent and intense lowered mood, as well as disruption to one''s ability to function in day to day matters. When sad we often go through a process called crying where we shed tears.