Luckily," he went on, "you have come to exactly the right place with your interesting problem, for there is no such word as 'impossible' in my dictionary. In fact," he added, brandishing the abused book, "everything between 'herring' and 'marmalade' appears to be missing.

There is no point in using the word 'impossible' to describe something that has clearly happened.

The impossible did not bother him unduly. If it could not possibly be done, then obviously it had been done impossibly.

Well, let us say inexplicable. There is no point in using the word "impossible" to describe something that has clearly happened. But it cannot be explained by anything we know.

The impossible often has a kind of integrity to it which the merely improbable lacks. How often have you been presented with an apparently rational explanation of something that works in all respects other than one, which is just that it is hopelessly improbable? Your instinct is to say, 'Yes, but he or she simply wouldn't do that.