“Therefore will evil come on you.
You will not know its dawning.
And mischief will fall on you.
You will not be able to ward it off by atonement.
And desolation will come on you suddenly,
Which you know not.”
Because she has trusted in extreme wickedness, wicked things (same word) will come on her. She will sow what she has reaped. And it will come surreptitiously, she will not know its dawning (in spite of her fortune-tellers and diviners). And she will not be able to ward off what is coming by atonement. She has gone too far for atonement. Her sin is unforgivable. So will come on her such desolation as she could not even begin to comprehend, for it is beyond anything she has ever known or heard of.
Again the ideas go far beyond anything Cyrus would do. What is being described here does not have Cyrus in mind. It is the ultimate judgment that will leave her stripped and bare.