sorrow UK /ˈsɒɹəʊ/US /ˈsɑɹoʊ/noun 2verb 2forms 4 noun2 •deep sadness after a loss or a great troubleBut sorrow that is couch'd in seeming gladness Is like that mirth fate turns to sudden sadness. — 1602 •(usually in plural) An instance or cause of unhappiness.Parting is such sweet sorrow. verb2 •To feel or express grief.‘Sorrow not, sir,’ says he, ‘like those without hope.’ — 1749 •To feel grief over; to mourn, regret.It is impossible to make a man naturally blind, to conceive that he seeth not; impossible to make him desire to see, and sorrow his defect. — 1603 formssorrowed · sorrowing · sorrows · sorrowest