Definition of regrettable adjective from the Oxford Advanced Learner's Dictionary

 

regrettable

 adjective
adjective
BrE BrE//rɪˈɡretəbl//
 
; NAmE NAmE//rɪˈɡretəbl//
 
 
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regrettable (that…) (formal) 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 incidentExtra examples It is highly regrettable that the delegate cannot be here in person. a deeply regrettable incident It is regrettable that the police were not informed sooner. This is a most regrettable incident. Steps will be taken to ensure it cannot happen again.
See the Oxford Advanced American Dictionary entry: regrettable