regrettable
adj.causing a feeling of sadness or disappointment because it is bad or wrong. You use this to describe a situation that you wish had not happened.
adj.causing or deserving of regret; expressing a feeling of sorrow or disappointment. Often used to describe events or circumstances that are unfortunate or undesirable.
“The company issued a regrettable apology for the mistake.”
“It was a regrettable situation that led to the cancellation of the entire project just weeks before the deadline.”
“While the decision was necessary to ensure long-term stability, it was a regrettable loss for the local community that had relied on the facility for decades.”
“Mitchell described the response as "regrettable and very unfortunate".”
“It’s a regrettable reality that there is never enough time to cover all the interesting scientific stories we come across.”
From regret + -able.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.