A fault that may be forgiven
A). Mercenary
B). Venial
C). Unforgivable
D). Inexcusable
Venial
One word substitute is Venial.
Mercenary: primarily concerned with making money at the expense of ethics.
Venial: (of a fault or offence) slight and pardonable.
Unforgivable: so bad as to be unable to be forgiven or excused.
Inexcusable: too bad to be justified or tolerated.