"Where the reality of the sin originans is rejected, the reality of an original moral agent for the fall is immediately abandoned, and with this, the moral character of the fall. At this point, the fall itself becomes a metaphor for the materiality of the created order. ... It is curious that attempts to avoid the supposed 'pessimism' of Paul, and of Augustine's reliance upon Paul, so regularly conclude in the definitive pessimism of metaphysical dualism, in which the root of evil is not sin but our material dispersion in space and time."

— Donald Keefe, Covenantal Theology (1991), p. 287, n. 59.

For reference (c/o Fr. John Hardon, SJ): 

Five qualities are generally attributed to Adam's transgression. It is seriously culpable, personal with Adam, technically original originating (originale originans), implied total aversion from God, and conversion or turning to creatures. ... It is sin as something habitual and not actual, natural and not personal, involving a moral state of soul and state of culpability, implying both the reatus culpae and the macula peccati, and properly described as original originated (originale originatum) as distinct from the personal sin of Adam.