Alasdair MacIntyre’s moral approach is ranked among the very important formulations in contemporary philosophical ethics. Yet, MacIntyre and his commentators have overlooked basic requirements of teleological ethical theories (end- or goal-oriented ethical theories). In the article, we will see just where MacIntyre has erred in constructing his Aristotelian-Thomist teleological moral approach, the most fundamental error being his failure to pursue and develop ultimate ends. MacIntyre’s moral approach, which heroically attempts to combine basic ancient and medieval foundational elements while assigning social practices a prominent role in shaping moral thinking, fails to provide a determinate teleological justificatory foundation.