Formal:
* സുഖമാണോ? (Sukhamaano?) - This is the most common and formal way to ask "how are you?".
* നിങ്ങൾക്ക് എങ്ങനെയുണ്ട്? (Ningalkku engane undu?) - This means "how are you?" but is more formal and can be used with someone you don't know well.
Informal:
* എങ്ങനെയുണ്ട്? (Engane undu?) - This is a more casual way to ask "how are you?" and can be used with friends and family.
* സുഖമല്ലേ? (Sukhamalle?) - This is a more informal way to ask "are you well?" and can be used with friends and family.
Other options:
* കാര്യങ്ങൾ എങ്ങനെയുണ്ട്? (Kaaryangal engane undu?) - This means "how are things?" and can be used in a more general sense to inquire about someone's well-being.
* എല്ലാം നന്നായിട്ടുണ്ടോ? (Ellum nanniyittundo?) - This means "is everything alright?" and can be used when you are concerned about someone's well-being.
It's also worth noting that the response to "how are you" in Malayalam is usually "സുഖമാണ്" (Sukhamaan) meaning "I am well."
Remember that the choice of which phrase to use depends on the context and the relationship you have with the person you are speaking to.