The definition of grief is a feeling of great sadness, especially when caused by a loss or death, or grief can describe being the cause of trouble for someone.(noun)
See grief in Webster's New World College Dictionary
Origin: ME gref < OFr, sorrow, grief < grever: see grieve
See grief in American Heritage Dictionary 4
Origin: Middle English
Origin: , from Old French
Origin: , from grever, to harm, aggrieve; see grieve.
Learn more about grief