名词形式：sadness

n. 悲哀；悲伤，悲痛；使人悲伤的事

I felt a deep sadness.

我感到深深的悲痛。

As the evening progressed, sadnessturned to rage.

随着夜晚的来临，悲伤变成了愤怒。

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。

Levin sat there, an expression of sadness on his face.

莱文坐在那里，神情忧伤。