Detraction
SIN OF REVEALING ANOTHER PERSON'S REAL FAULTS TO A THIRD PERSON WITHOUT A VALID REASON (THEREBY LESSENING THE REPUTATION OF THAT PERSON) ACCORDING TO ROMAN CATHOLIC THEOLOGY
In Christian theology, detraction is the sin of revealing another person's real faults to a third person without a valid reason, thereby lessening the reputation of that person.Catechism of the Catholic Church, § 2477–2479 It holds, in the Roman Catholic Church, the status of a mortal sin from the perspective of moral theology.