Isaiah 47:11

But evil shall come upon you, which you will not know how to charm away ; disaster shall fall upon you, for which you will not be able to atone ; and ruin shall come upon you suddenly , of which you know nothing .

Disaster will come upon you, and you will not know how to conjure it away. A calamity will fall upon you that you cannot ward off with a ransom; a catastrophe you cannot foresee will suddenly come upon you.

Therefore shall evil come upon thee; thou shalt not know from whence it riseth : and mischief shall fall upon thee; thou shalt not be able to put it off : and desolation shall come upon thee suddenly, which thou shalt not know.