~ (that...) that you are sorry about and wish had not happened:
It is regrettable that the police were not informed sooner. * The loss of jobs is highly regrettable. * a regrettable incident
regrettably adverb:
Regrettably, crime has been increasing in this area. * This fine restaurant has, regrettably, gone out of business. * There is regrettably little evidence to support this argument.
