Immorality, n.; pl. Immoralities.
Etymology: [Cf. F. immoralité.]
1. The state or quality of being immoral; vice. The root of all immorality. Sir W. Temple.
2. An immoral act or practice. Luxury and sloth and then a great drove of heresies and immoralities broke loose among them. Milton.
Shades of meaning
Fernald has no entry of its own for immorality; he lists it under sin.
Where he writes about it:
Immorality denotes outward violation of the moral law. — from sin
Sin is thus the broadest word, and immorality next in scope; all crimes, properly so called, and all immoralities, are sins; but there may be sin, as ingratitude, which is neither crime, transgression, nor immorality; and there may be immorality which is not crime, as falsehood. — from sin