"grieving" in the verb sense
1. grieve, sorrow
feel grief
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)
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