"No, thank you."
That's 100% polite. Nothing more really needs to be said.
I'll also add that the ability to say "No, thank you" is perhaps the single most important professional skill you can learn.
That's 100% polite. Nothing more really needs to be said.
I'll also add that the ability to say "No, thank you" is perhaps the single most important professional skill you can learn.
Personally understanding how neurotic/anxious I am empowers me to be able to say no, as I try to consciously be aware that subconsciously I am less likely to say no when it’s in my best interest.