Question

What is a more formal way of saying 'have no right'? ie. "They have no right to address me in that tone"

Answer 1

formal ways for saying not right could be, "incorrect, improper, unsuitable etc"

Step-by-step explanation:

in your example though, you could say "they have no entitlement to address me in that tone" or "they have no authority to address me in that tone"

Answer 2

You could say, "they have no authority to address me in that tone".