noun

1. intense emotional suffering caused by loss, disaster, misfortune, etc.; acute sorrow; deep sadness
2. a cause or the subject of such suffering
3. Informal
   1. irritation or frustration, esp. from accidents, mishaps, etc. the griefs of a computer operator
   2. trouble; difficulty; problem enough grief for one day
   3. a cause of any of these

Etymology: ME gref < OFr, sorrow, grief < grever: see grieve