'Unstable' in the Bible

An indecisive man is unstable in all his ways.

They have eyes full of adultery and are always looking for sin. They seduce unstable people and have hearts trained in greed. Children under a curse!

He speaks about these things in all his letters in which there are some matters that are hard to understand. The untaught and unstable twist them to their own destruction, as they also do with the rest of the Scriptures.