Wrong, in the context of a set of beliefs. Sin, if one believes in such things. When asking if an action is immoral, usually it is first necessary to determine what morality is. Oft-times, people have no clear concept of right and wrong, acting instead on ad hoc beliefs when their status quo is challenged.

Im`mo*ral"i*ty (?), n.; pl. Immoralities (#). [Cf. F. immoralit'e.]

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.

© Webster 1913.