Formal:
* Chacha (ചാച്ച): This is the most common and formal way to address an uncle.
* Achan (അച്ഛൻ): While literally meaning "father," it can be used respectfully to address an older male relative, including uncles.
* Perumannu (പെരും മനു): This literally means "big man" and is used to address someone older and respected, including uncles.
Informal:
* Chacha (ചാച്ച): This is also commonly used in informal settings.
* Chetta (ചേട്ട): This literally means "elder brother," but can be used to address an uncle who is close to your age.
* Eṭṭan (എട്ടൻ): This is another term for "elder brother" and can also be used to address a close uncle.
* Chachan (ചാചൻ): This is a more familiar and endearing term for uncle.
Choosing the right term:
* Age: Use formal terms like "Chacha" or "Achan" for older uncles. For uncles closer in age, you can use informal terms like "Chetta" or "Eṭṭan."
* Relationship: If you are close to your uncle, you can use more informal terms like "Chachan."
* Context: In formal settings, it's always best to use more respectful terms like "Chacha."
Ultimately, the best way to address your uncle is to observe how other family members do so and follow their lead.