King James Version
Then the LORD will make thy plagues wonderful, and the plagues of thy seed, even great plagues, and of long continuance, and sore sicknesses, and of long continuance.English Standard Version
then the LORD will bring on you and your offspring extraordinary afflictions, afflictions severe and lasting, and sicknesses grievous and lasting.New International Version
the LORD will send fearful plagues on you and your descendants, harsh and prolonged disasters, and severe and lingering illnesses.