Full Definition of SORROW1a : deep distress, sadness, or regret especially for the loss of someone or something loved b : resultant unhappy or unpleasant state <to their great sorrow they could not marry> 2 : a cause of grief or sadness 3 : a display of grief or sadness See sorrow defined for English-language learners See sorrow defined for kids Improve your SCRABBLE?? game with our official Word