Formal:
* Caro/a: This is the most formal way to say "dear" and is used in written communication and when addressing someone you don't know well. For example, "Caro Sr. Silva" (Dear Mr. Silva).
* Prezado/a: Similar to "Caro/a" but slightly less formal. It can be used in both written and spoken communication.
* Estimado/a: This means "respected" and is used when you want to express your esteem for someone.
Informal:
* Querido/a: This is the most common way to say "dear" in informal situations, like when addressing a friend or family member.
* Meu/minha: This means "my" and is used to show affection, like "Meu amor" (My love).
* Benzinho/a: This is a more affectionate and endearing way to say "dear," like "Benzinho, como estás?" (Dearest, how are you?).
The best way to choose the right word depends on the situation. Consider who you are talking to and the level of formality required.