melancholy

sad, unhappy, gloomy, blue, sorrowful, melancholy

这些形容词均含“忧伤的，悲哀的，伤感的”之意。
sad: 最常用词，泛指一切形式的悲伤，着重暂时的不幸或感觉的忧伤。
unhappy: 多指日常生活中遇到不如意的事而感到不愉快、不幸，侧重指心理状态。
gloomy: 指愁眉苦脸，令他人也感到扫兴。
blue: 非正式用词，语气较随便，指较强烈的忧郁或沮丧。
sorrowful: 多指因丧失亲人等原因所引起的悲哀，也指由于错误而产生的悔恨交加的心情。
melancholy: 指经常性的忧郁或悲哀，多用于文学描写中。

名词 melancholy:

1. a feeling of thoughtful sadness
2. a constitutional tendency to be gloomy and depressed
3. a humor that was once believed to be secreted by the kidneys or spleen and to cause sadness and melancholy
   同义词：black bile

形容词 melancholy:

1. characterized by or causing or expressing sadness
   同义词：melancholic
2. grave or even gloomy in character
   同义词：somber, sombre

1. A deep melancholy runs through her poetry.
   她的诗中贯穿著悲伤的情调。
2. Melancholy is the preponderant mood of the poem.
   忧郁的感情是该诗的基调。
3. There is a vein of melancholy in his character.
   他的性格中有少许忧郁的气质。
4. A funeral is a melancholy occasion.
   葬礼是一个令人忧伤的场合。
5. When he left, she sank into melancholy.
   当他走后，她陷入沉思。