Source : Webster's Revised Unabridged Dictionary (1913)

Grieving \Griev"ing\, a.
   Sad; sorrowful; causing grief. -- n. The act of causing
   grief; the state of being grieved. -- {Griev"ing*ly}, adv.
   --Shak.

Grieve \Grieve\ (gr[=e]v), v. t. [imp. & p. p. {Grieved}; p. pr.
   & vb. n. {Grieving}.] [OE. greven, OF. grever, fr. L. gravare
   to burden, oppress, fr. gravis heavy. See {Grief.}]
   1. To occasion grief to; to wound the sensibilities of; to
      make sorrowful; to cause to suffer; to afflict; to hurt;
      to try.

            Grieve not the Holy Spirit of God.    --Eph. iv. 30.

            The maidens grieved themselves at my concern.
                                                  --Cowper,

   2. To sorrow over; as, to grieve one's fate. [R.]

Source : WordNet®

grieving
     adj : sorrowful through loss or deprivation; "bereft of hope"
           [syn: {bereaved}, {bereft}, {grief-stricken}, {mourning(a)},
            {sorrowing(a)}]