Formal:
* ரொம்ப நல்லது (romba nallathu): This is the most common and literal translation. It means "very good" or "very nice".
* மிகவும் நல்லது (migavum nallathu): This is a more formal way of saying "very nice" and means "very good".
Informal:
* ரொம்ப சூப்பர் (romba super): This is a common way to say "very nice" in a casual setting. It means "very super" or "very good".
* ரொம்ப லூசு (romba loose): This is a more informal way to say "very nice" and means "very cool" or "very good".
* ரொம்ப அருமை (romba arumai): This means "very beautiful" or "very nice" and is commonly used to express appreciation.
To express appreciation for someone's effort or kindness:
* நல்லா இருக்கு (nalla irukku): This means "it's good" or "it's nice" and can be used to express appreciation for someone's work or kindness.
The best way to say "are very nice" in Tamil depends on the context and the person you are talking to.