double-souled: a person whose loyalty to God is inwardly split between God and the world
The word literally means "double-souled," and James uses it for the person whose inner allegiance is divided rather than whole. It is not a description of someone who is intellectually unsure or simply hesitant. It names a deeper fracture: the self is pulled at once toward God and toward the world, so that loyalty is never single.
The word stands behind much of the letter of James as the opposite of everything James prizes. James calls believers to be whole and complete, and he describes God himself as giving generously and without reserve. The double-souled person is the inverse of both: divided where God is single, holding back where God gives freely.
Its two appearances show the same condition from two angles. In the first, the divided self surfaces in prayer: the person asks God for wisdom but is too torn to trust, and so is as unsettled as a wave driven by the wind. In the second, it surfaces in how a person actually lives, set alongside the word for sinners and called to repent. Older scholars sometimes tried to make these two separate meanings, but the better reading keeps them as one condition seen from two sides, which is why the senses below share a single core.