It depends on whom you want to say these bad words to. If it is to a friend it's best to say, "No I don't like this/ don't like the way you treat me/are talking to me"or "No it is not possible for me to ................" or" No it's just not on" or "Sorry I'm too busy this weekend" If it is your employer, say, "I would love to attend to your request, but it is not possible at present because I am working hard to finish Project X/ Report Y for our company".

I can not link a bad word to politely way ..... How to be polite and I say a bad word ..... contradiction

Of course, you need express your angry in your entonation words, and your faces too. I think if you memorize polite expressions without emotions in your words, you will look a strange human, a kind of robot!

You may want to talk to a friend. There is no way to say bad words politely. It will always be bad.