sad adjective (NOT HAPPY)
She gave a sad smile. 她露出了一丝苦笑。
I'm so sad (that) you can't come. 你不能来，我很遗憾。
- We said our sad farewells and got on the bus.
- I don't feel angry so much as sad.
- That was such a sad film.
- I just felt sad for her.
- I was very sad when our cat died.
sad adjective (UNPLEASANT)