Informal:
* "Ningalukku vittu poyiyooo?" (നിങ്ങള്ക്ക് വിട്ടു പോയിയോ?) - This literally translates to "Did you lose your mind?" It's a casual and playful way to say "Are you crazy?"
* "Ningal paathu kalikkune?" (നിങ്ങള് പാത്തു കളിക്കുന്നേ?) - This translates to "Are you playing crazy?" It's a more humorous way to say it.
* "Ningal kalyanam?" (നിങ്ങള് കല്യാണം?) - This translates to "Are you mad?" It's a more casual and slightly less polite way to say it.
Formal:
* "Ningal vishamam?" (നിങ്ങള് വിഷമം?) - This translates to "Are you upset/disturbed?" It's a more polite way to say "Are you crazy?"
* "Ningal onnu cheyttu?" (നിങ്ങള് ഒന്ന് ചെയ്തു?) - This translates to "Did you do something?" It's a more subtle way to say "Are you crazy?"
The best way to say "Are you crazy" in Malayalam depends on the situation and your relationship with the person you're talking to.
It's always good to be mindful of your tone and choose your words carefully.