From what he could see, the physical layout was not entirely impossible.

There are times when there is so much data that it would be entirely impossible to store locally.

It takes a long time to work through, but it means advances aren't entirely impossible.

It was improbable, but not entirely impossible and wouldn't I look funny producing at my late age?

Or it might start with his first experimental use of that metal with entirely impossible results.

The position of the Beeb is, of course, entirely impossible.

It is impossible to loose oneself from this chain entirely.

It was not entirely impossible that a stool might have become spontaneously airborne.

That would perhaps require some creative maneuvering, but it's not entirely impossible.

"After all, it's not entirely impossible that the bags could have been tampered with."