Excessive means going way beyond what's reasonable, necessary, or appropriate. When something is excessive, there's just too much of it.

If you put one or two chocolate chips in your cookies, that's fine. If you dump in the entire bag so the cookies are more chocolate than dough, that's excessive. If you practice piano for an hour a day, you're building a skill. If you practice for six hours until your fingers hurt and you can't do your homework, that's excessive.

The word carries a sense of imbalance or overdoing it. Excessive talking means you're dominating the conversation and not letting others speak. Excessive spending means buying way more than you need or can afford. A restaurant might charge excessive prices if they ask $50 for a plain hamburger.

What counts as excessive depends on context. Five pages might be excessive for a book report but perfectly normal for a research paper. The key is that something excessive crosses a line from enough to too much. It's the difference between enthusiastic and overwhelming, between generous and wasteful, between confident and overbearing.