sadness
n. 悲伤，悲痛；使人悲伤的事（或难过）的事
例句
I felt a deep sadness.
我感到深深的悲痛。
《牛津词典》
As the evening progressed, sadness turned to rage.
随着夜晚的来临，悲伤变成了愤怒。
《柯林斯英汉双解大词典》
There was more than a hint of sadness in his voice.
他的声音中流露出了深切的悲伤。
