'Delusions' in the Bible

I also will choose their delusions, and will bring their fears upon them; because when I called, none did answer; when I spake, they did not hear: but they did evil before mine eyes, and chose that in which I delighted not.

Then the LORD told me, "The prophets are prophesying lies in my name. I didn't send them, I didn't command them, and I didn't speak to them. They're proclaiming to you false visions, worthless predictions, and the delusions of their own minds.

Those prophets are just prophesying lies. They are prophesying the delusions of their own minds.