regrettable

This term conveys a sense of unfortunate necessity or a mistake that cannot be undone. It is frequently used in formal or professional contexts to soften the blow of bad news or to express a polite, distanced form of apology without necessarily accepting full personal liability. While it describes something sad or disappointing, it differs from "tragic" by focusing on the appropriateness or the avoidable nature of the event. It often implies that a better outcome was possible or that a specific standard of behavior was not met.