The word "unlived" means that something has not been experienced or enjoyed yet. It refers to things that were not able to happen or be fulfilled. Full definition
Reflecting on her experiences as a therapist, Horney observed that the most powerful forms of anger and guilt that she had encountered were the anger and guilt of unlived life — i.e., of diminished growth. (religion-online.org)
As I have struggled to handle my own existential anxiety and guilt (the guilt of unlived life) in more life - enhancing ways through the years, I have become aware at times of the power of existential acceptance. (religion-online.org)