<unk>  is a mood characterized by feelings of disadvantage and loss. When sad, people often become quiet, less energetic and withdrawn.<unk>  is considered to be the opposite of happiness, and is similar to the emotions of sorrow, grief, misery and melancholy. The philosopher Baruch Spinoza defined<unk>  as the “transfer of a person from a large perfection to a smaller one.”<unk>  is a temporary lowering of mood ('feeling blue'), whereas clinical 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.
Sadness
Work aversion
Satiety
Jealousy
Blunted affect
Louping ill
Fear of the dark
Somatization