Formal:
* എനിക്ക് സുഖമാണ് (enikku sukhamaanu): This is the most formal and literal translation of "I am fine". It means "I am well".
Informal:
* നന്നായിട്ടുണ്ട് (nannayittundu): This is a more common and casual way to say "I am fine". It means "I am good".
* സുഖം (sukham): This is a very informal way to say "I am fine". It literally means "well-being" but is used as a short answer to "How are you?"
Even more informal:
* ശരി (shari): This means "okay" or "all right" and can also be used to express that you are fine.
You can choose the appropriate phrase based on the situation and who you are talking to.