Some believe if you've committed a major, unconfessed sin, you'll go to hell.
From the newsobserver.com
What happens if you die with an unconfessed major sin?
From the newsobserver.com
The burden of unconfessed sin.
From the denverpost.com
Meanwhile, a documentary filmmaker was accusing the FBI of a second set of pyrotechnic attacks yet unconfessed by the bureau.
From the time.com
As you can imagine, the film is entirely blasphemous and those of us who still harbor a secret admiration of the Monty Python films probably have loads of unconfessed sin.
From the evangelicaloutpost.com
More examples
People who have not confessed; "the unconfessed cannot be forgiven"