sadness

sadness
sad‧ness /ˈsædnəs, ˈsædnɪs/ noun [uncountable]the state of feeling sad
   SYN  unhappiness
    great/deep sadness
    She sensed Beth’s deep sadness.
    It was with great sadness that we learned of his death.
    There was a touch of sadness in his voice (=he sounded a little sad).
    His relief was tinged with sadness (=he also felt rather sad).
     

THESAURUS

   ▪ sadness a sad feeling, caused especially when a happy time is ending, or when you feel sorry about someone else’s unhappiness: Charles felt a great sense of sadness and loss. | I noticed a little sadness in her eyes.
   ▪ unhappiness the unhappy feeling you have when you are in a very difficult or unpleasant situation, especially when this lasts for a long time: After years of unhappiness, she finally decided to leave him. | She was a tense, nervous young woman, whose deep unhappiness was obvious to all those around her. | You do not know how much pain and unhappiness you have caused.
   ▪ sorrow written the feeling of being very sad, especially because someone has died or because terrible things have happened to you: There seemed to be nowhere to go to be alone with her sorrow. | His heart was filled with great sorrow after her death.
   ▪ misery great unhappiness, caused especially by living or working in very bad conditions: The cold weather is with us again and the misery of the homeless is increasing. | Thousands of families were destined to a life of misery. | The misery and pain he caused were, for him, merely a measure of his success.
   ▪ despair a feeling of great unhappiness, because very bad things have happened and you have no hope that anything will change: At the end of the month, she still had no job and was tired, frustrated, and close to despair.
   ▪ grief great sadness that you feel when someone you love has died: He was overcome with grief when his wife died.
   ▪ heartache a strong feeling of great sadness, especially because you miss someone you love: She remembered the heartache of the first Christmas spent away from her sons.
   ▪ depression a mental illness that makes someone feel so unhappy that they have no energy or hope for the future, and they cannot live a normal life: He slipped into a depression in which he hardly ate or even left his room.
   ▪ despondency formal a feeling of being very unhappy and without hope: She felt useless, and this contributed to her despondency.
   ▪ melancholy literary a feeling of sadness, that you feel even though there is no particular reason for it: Modigliani expressed his melancholy through his painting.