Formal:
* أخي العزيز جدًا (akhi al-aziz jiddan): This translates literally to "my very dear brother". It's a very respectful and formal way to address a brother.
* أخي الكريم جدًا (akhi al-karim jiddan): This translates to "my very honorable brother". It's also a very formal and respectful phrase.
Informal:
* أخي حلو كتير (akhi halu ktir): This translates to "my brother is very nice". It's a casual and affectionate way to address a brother.
* أخي مزيون كتير (akhi maz'oon ktir): This translates to "my brother is very handsome". It's a casual and affectionate way to address a brother, emphasizing his good looks.
You can also combine the word "brother" with an adjective that describes his personality, such as:
* أخي لطيف جدًا (akhi latiff jiddan): "My brother is very kind"
* أخي طيب جدًا (akhi tayib jiddan): "My brother is very good"
The best way to say "Very nice brother" in Arabic will depend on your relationship with the brother, the context of the conversation, and the level of formality you want to convey.