How to say NO
The word no is a simple direct statement that conveys its meaning completely. There is no reason the apologises or give a reason. There is absolutely no need to enter into a debate or to justify your answer. If the other party insists on a reason the simplest response is
"What part of the word no didn't you understand"
We have to make sure that when we say No we mean exactly that word. It is not anything else. Some people think it might mean YES or MAYBE, or I'LL THINK ABOUT IT or that you might change your mind. There is really no other way how to say no
Change the subject depending on who you are talking to using such phrases "How about we...., or whatever suits the occasion.