sad

The small child felt incredibly sad when his favorite red balloon accidentally floated away into the sky.

(Chinese) 当小孩子心爱的红气球不小心飘向天空时，他感到无比悲伤。

It was a deeply sad moment when the community gathered to mourn the loss of the historic library.

(Chinese) 当社区聚集在一起哀悼那座历史悠久的图书馆的损毁时，那是一个深切悲伤的时刻。