Of course there are ways to do that. Some of them are listed below:
1. Hide your status message so that they don’t comment on it or like it.
2. Appear offline on chat so that the unwanted person cannot see when you are online
3. Avoid their updates merely by hiding your unwanted friend from your feed if their updates are irritating or boring
I had found a useful article suited for your query: Facebook : Unfriend someone without actually deleting them from your friend list
It will greatly help you.