1. In the English language, an instance of the word "this" which lacks a referent, i.e. some other word which explains what the "this" in question refers to. Lacking a referent, the "this" is thus "naked" and may prove confusing to the reader or listener, since they do not know precisely to what the writer or speaker is referring.
Sue: I really hate this.
John: Really hate what? You employed a "naked this" there so I don't know what you are talking about.