a. experiencing or showing sorrow or unhappiness
s. of things that make you feel sad
a. 忧愁的, 悲哀的
1. I felt sad when my friend moved away.
当我的朋友搬走时，我感到很难过。
2. The movie was so sad that it made me cry.
这部电影太悲伤了，令我哭了。
3. She looked sad because she lost her favorite toy.
她看起来很难过，因为她丢失了她最喜欢的玩具。