Confusion

If I "confuse x" then I have made x confused, ie difficult to discern.

When x is a person (confuse Steven), it makes the person unable to discern things (The entrance of my evil twin confused Steven; he could not tell which was his real friend).

When x is an object , I have made the object difficult to be discerned. The thing is I can't think of this ever taking a singular object. You always have to cause confusion between two things. So I can confuse papers (by mixing them around), and I can confuse the desk (supposedly with another desk, or a chair that happens to be shaped like a desk), but in general you cannot confuse a thing without having another (possibly implied) direct object with which you are confusing it.

Confuse means different things when used with people and objects. That's neat.

Cleave is its own antonym.