nameless

adjective [原级]不可名状的，难以形容的；匿名的

You may end up buying their book on the way out, but soon afterwards, it is much like fast food, and you get a nameless sense that you've been cheated.
你可能会在出去的路上买他们的书，但它就像快餐一样，你很快就会有一种莫名其妙的感觉，觉得自己被骗了。