When you're in school and the teacher says you've got to write a thousand words on a topic, I'm not going to hold it against you if you fill up those two pages with empty words. But if I buy your book and you do the same thing, I'm going to get upset. And in this particular example, I'm every reader. None of us like empty words...but all writers, even me, end up using them.
Very Merry Unwriting to You
Empty words are those words that mean nothing by themselves. Very, for example, cannot stand alone. Just, really, way and suddenly are all pretty empty, and they're all pretty over-used. When used in this context, pretty is also empty. They're empty because they don't lend anything to the story. The argument can be made that they help add emphasis, but let's not kid ourselves. There are other ways to emphasize without adding extra words. Too many of those empty words will make your book feel...well, empty.