Here's how it's used:
* "Él es muy generoso." (He is very generous.)
* "Ella es una mujer generosa." (She is a generous woman.)
* "Fue un gesto generoso." (It was a generous gesture.)
You can also use "dadivoso/dadivosa" which has a similar meaning but emphasizes the act of giving.
* "Es una persona dadivosa." (He/She is a giving person.)
The choice between generoso/generosa and dadivoso/dadivosa depends on the context and the specific nuance you want to convey.