Sad (adjective)

1. Feeling sorrow; unhappy.
2. Causing sorrow or unhappiness.

Origin:

Old english sæd, of germanic origin; related to dutch zat and german satt.

Examples:

1. He felt sad after the loss of his dog.
2. She looked sad when she heard the news.
3. The sad story made me cry.
4. The sad music made her feel melancholic.
5. The sad look on her face made it clear that she was not happy.