One word. Seven letters. Simple as that.
Now, say it like you mean it.
I will say it if you want me to. I won't, however, mean it.
For this is not over. This is just a new start of something greater that is about to come.
Don't be naive. Goodbyes are supposed to be GOOD. Feel free to say it as long as you don't mean it.
Alors then, "GOODBYE".