How do you say in Portuguese language stay good?

There isn't a direct translation for "stay good" in Portuguese that conveys the same meaning as the English phrase. However, depending on the context, you could use these options:

Formal:

* "Fique bem": This literally means "stay well," which is a polite and appropriate way to say goodbye.

* "Mantenha-se bem": This means "keep well" and is another formal way to wish someone well.

Informal:

* "Seja feliz": This means "be happy" and is a more casual way to say goodbye.

* "Tudo de bom": This means "all the best" and is a common way to wish someone good luck.

* "Vá com Deus": This literally means "go with God" and is a common farewell, similar to "God bless you" in English.

The best option will depend on the specific situation and your relationship with the person.