11 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.

Read Isaiah 47:11 Using Other Translations

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.
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.
So disaster will overtake you, and you won’t be able to charm it away. Calamity will fall upon you, and you won’t be able to buy your way out. A catastrophe will strike you suddenly, one for which you are not prepared.