'Worthless' in the Bible

There will no longer be worthless visions and flattering divinations in the midst of Israel's house.

"Son of man, the house of Israel has become slag to me. All of them are like bronze, tin, iron, and lead in the furnace; they are the worthless slag of silver.

Thus says the Lord Yahweh: "And I will destroy [the] idols, and I will put an end to [the] worthless idols from Memphis. And there will {no longer be} a prince from the land of Egypt, and I will put fear in the land of Egypt.