Beyond/past redemption
Definition 1 of 1
Pro Tip 1/3Irreversible State
Use it when something can't be changed back to a good condition. 
After the scandal, his reputation was beyond redemption.
Pro Tip 2/3Negative Emphasis
Emphasizes the negative extent of a situation or condition. 
He was so dishonest that his integrity was considered beyond redemption.
Pro Tip 3/3No Hope
Expresses a lack of hope for improvement or rectification. 
The car was so rusted that it was beyond redemption.