"Well, suppose you have a roof with a hole in it. That means it is a leaky roof. It’s leaky all the time—even if it’s not raining at the moment. But it’s only leak ing when it happens to be raining. In the same way, morphine-seeky means that you always have this tendency to look for morphine, even if you are not looking for it at the moment. But I prefer both of them to ‘addict,’ because they are adjectives modifying Bobby Shaftoe instead of a noun that obliterates Bobby Shaftoe."