Then there's a great open nothingness, unless we're greatly mistaken.

The bodies have been tampered with, or I'm greatly mistaken.

If you think Google hasn't innovated with Andriod, you're greatly mistaken.

We'll have a turn-away this afternoon, too, unless I am greatly mistaken.

In its size I had been greatly mistaken.

"If you think I'm going to ride in that flying coffin you're greatly mistaken."

That piercing laugh had been a woman's, unless he was greatly mistaken.

If so, you are greatly mistaken.

If Melbourne and the rest thought that the young man would soon be forgotten they were greatly mistaken.

Indeed, you are greatly mistaken if you doubt for one moment on the very great value of your constant and most kind assistance to us.