adj.
VERBS
▪ be , seem
ADVERB
▪ deeply , extremely , highly , truly , very
▪
a deeply ~ incident
▪
It is highly ~ that the delegate cannot be here in person.
▪ rather
▪ especially , particularly
▪
His death is particularly ~ because this condition could have easily been treated.
Regrettable is used with these nouns: ↑ incident