regrettable
adjective
UK/rɪˈɡret.ə.bᵊl/
US/rɪˈɡret̬.ə.bᵊl/
Definitions of regrettable adjective
causing a feeling of sadness or disappointment over something that has happened or been done.
It was a most regrettable decision.
He made a regrettable comment.
The project failed due to some regrettable errors.