'Unstable' in the Bible

[he is] a double-minded man, unstable in all his ways.

having eyes full of [desire for] an adulteress and unceasing from sin, enticing unstable persons, [and] having hearts trained for greediness. Accursed children!

as [he does] also in all his letters, speaking in them about these [things], in which there are some [things] hard to understand, which the ignorant and unstable distort to their own destruction, as [they] also [do] the rest of the scriptures.