Pleonektes (πλεονέκτης) means a covetous or greedy person — literally 'one who wants more.' It combines pleon (more) and echo (to have). This is not simply a person who desires good things but one whose defining characteristic is an insatiable appetite to acquire more, especially at the expense of others.
Paul consistently lists the pleonektes alongside the most serious sinners. In 1 Corinthians 5:10-11, the greedy person is listed with the sexually immoral, swindlers, and idolaters — and believers are told not even to eat with such a person who claims to be a brother. In 1 Corinthians 6:10, Paul states plainly that the greedy will not inherit the kingdom of God. In Ephesians 5:5, he equates greed with idolatry: a pleonektes is literally an idolater, because the thing desired has replaced God as the object of devotion. Scripture treats insatiable greed not as ambition but as a form of worship directed at the wrong god.