regret /ɹɪˈɡɹɛt/verb 3noun 4forms 5 verb3 •to feel sorry about something in the past and wish that it had been differentHe regretted his words.I don't regret enrolling in law, but I regret not studying some Chinese. •To feel sorry about (any thing).I regret that I have to do this, but I don't have a choice.They said they regretted to inform us that the train would be late. •(no longer used) To miss; to feel the loss or absence of; to mourn.He more than ever regretted his home, and with increased desire longed to see his family. — 1845 noun4 •Emotional pain on account of something done or experienced in the past, with a wish that it had been different; a looking back with dissatisfaction or with longing.What man does not remember with regret the first time he read Robinson Crusoe? — 1828 •One who was invited to an event who was unable to attend, but notified the organizer of this beforehand; a nonattendee. •The amount of avoidable loss that results from choosing the wrong action.Under squared errorloss we show that there exists unique minimax regret solution for the problem of selecting the threshold. — 2002 •(no longer used) Dislike; aversion.Is it a vertue to have some ineffective regrets to damnation, and such a Vertue too, as shall serve to ballance all our vices? — 1667 formsregretted · regretting · regrets · regretteth · regrettest