'Unstable' in the Bible

being a double-minded man, unstable in all his ways.

having eyes full of adultery that never cease from sin, enticing unstable souls, having a heart trained in greed, accursed children;

as also in all his letters, speaking in them of these things, in which are some things hard to understand, which the untaught and unstable distort, as they do also the rest of the Scriptures, to their own destruction.