Johnson's 1755 Dictionary represents the verb to deprave with an uncharacteristic lack of discrimination:
To vitiate; to corrupt; to contaminate.The Oxford English Dictionary, on the other hand, registers historical and theological shifts in usage:
depravity An extension of pravity (ad. L. pravitas) previously used in same sense, after deprave and its derivatives. (No corresponding form in Latin or French.) The quality or condition of being depraved or corrupt.a. Perverted or corrupted quality. Obs.
b. Perversion of the moral faculties; corruption, viciousness, abandoned wickedness.
c. Theol. The innate corruption of human nature due to original sin. Often total depravity: In common use from the time of Jonathan Edwards: the earlier terms were pravity and depravation.
d. A depraved act or practice.
depraved 1. Rendered bad or worse; perverted, vitiated, debased, corrupt. Now chiefly of taste, appetite, and the like.
2. spec. Rendered morally bad; corrupt; wicked.