'Unexpectedly' in the Bible

I'll make their widows more numerous than the sand of the sea. At noontime I'll send a destroyer against the mother of a young man. I'll cause terror and anguish to come to her unexpectedly.

Let cries of terror be heard in their houses when you send bands of raiders unexpectedly to plunder them. For they have virtually dug a pit to capture me and have hidden traps for me to step into.