vanishingly improbable

It would need a gigantic and vanishingly improbable leap across genetic hyperspace.

This is of no importance, since it now appears vanishingly improbable that I will ever see Enemy personnel.

For just the same reason, it is vanishingly improbable that exactly the same evolutionary pathway should ever be travelled twice.

The same argument could be extended to any other region of the electromagnetic spectrum (although a creature able to see using, say, X-rays is vanishingly improbable in terms of basic biology).

It was vanishingly improbable that the works filed there-pre-Hiatus fiction, a collection which Adele had chosen to recreate though she didn't share her mother's taste-was of any interest to him.

You can't even wait for a human to figure out what went wrong: you have to have previously thought of every possible thing that can possibly go wrong, which is vanishingly improbable.

When this happens, the business challenge switches from being a technical challenge that needs good programmers to being a marketing challenge that requires, somehow, the ability to break through the pack and establish a brand name, something that is vanishingly improbable.