O affedilmez bir hataydı. - That was an unforgivable error.
Yaptığım şey affedilmez. - What I've done is unforgivable.
الإنجليزية - الإنجليزية
تعريف unforgivable في الإنجليزية الإنجليزية القاموس.
If you say that something is unforgivable, you mean that it is very bad, cruel, or socially unacceptable. These people are animals and what they did was unforgivable = inexcusable. an unforgivable action is so bad or cruel that you cannot forgive the person who did it