irretrievable

This term conveys a sense of absolute finality and permanence. While "lost" simply describes the current state of an object, "irretrievable" emphasizes the impossibility of recovery, suggesting that no amount of effort or resource can reverse the loss. It carries a heavy, often tragic or clinical tone.

In legal and interpersonal contexts, specifically regarding marriage, the term is used to describe a state of total collapse. When a relationship is described as "irretrievably broken," it implies that the emotional damage is so severe that reconciliation is logically and practically impossible, moving the situation beyond the realm of repair.