The Problem of Talking Meaningfully About People

If a thing is unique, then it is meaningless to talk about it, because anything you say about it will not be exactly accurate. This is obviously a two edged sword, because gaud is not the only unique item around. It may well be that god is more unique than anything else, but there're other things that are unique as well. How is it possible to talk meaningfully about people when each person is from each other person? We don't be quiet and say nothing about human beings simply because human beings are not identical to each other.