sorrow in WordNet English dictionary

1. something that causes great unhappiness
   "her death was a great grief to John"
   grief  sorrow 
   
2. sadness associated with some wrong done or some disappointment
   "he drank to drown his sorrows"; "he wrote a note expressing his regret"; "to his rue, the error cost him the game"
   sorrow  regret  rue  ruefulness 
   
3. the state of being sad
   "she tired of his perpetual sadness"
   sadness  sorrow  sorrowfulness 
   
4. an emotion of great sadness associated with loss or bereavement
   "he tried to express his sorrow at her loss"
   sorrow 
   

1. feel grief
   grieve  sorrow