Acedia in The Seven Deadly Sins and the Four Last Things, by Hieronymus Bosch. Sloth is one of the seven deadly sins in Catholic teachings. It is the most difficult sin to define and credit as sin, since it refers to an assortment of ideas, dating from antiquity and including mental, spiritual, pathological, and conditional states.[1] One definition is a habitual disinclination to exertion, or laz