"grieving" in the verb sense
1. grieve, sorrow
2. grieve, aggrieve
cause to feel sorrow
"his behavior grieves his mother"
"grieving" in the adjective sense
1. bereaved, bereft, grief-stricken, grieving, mourning, sorrowing
sorrowful through loss or deprivation
"bereft of hope"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License