The Collaborative International Dictionary of English v.0.48:

Dolorous \Dol"or*ous\, a. [L. dolorosus, from dolor: cf. F.
   douloureux. See Dolor.]
   1. Full of grief; sad; sorrowful; doleful; dismal; as, a
      dolorous object; dolorous discourses.
      [1913 Webster]

            You take me in too dolorous a sense;
            I spake to you for your comfort.      --Shak.
      [1913 Webster]

   2. Occasioning pain or grief; painful.
      [1913 Webster]

            Their dispatch is quick, and less dolorous than the
            paw of the bear or teeth of the lion. --Dr. H. More.
      -- Dol"or*ous*ly, adv. -- Dol"or*ous*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

dolorous
    adj 1: showing sorrow [syn: dolorous, dolourous,
           lachrymose, tearful, weeping]

Moby Thesaurus II by Grady Ward, 1.0:

61 Moby Thesaurus words for "dolorous":
   affecting, afflicted, afflictive, aggrieved, anguished, bitter,
   bleak, calamitous, careworn, cheerless, comfortless, deplorable,
   depressing, depressive, dire, discomforting, dismal, dismaying,
   distressful, distressing, doleful, dolorific, dolorogenic, dreary,
   dumb with grief, grief-stricken, griefful, grieved, grievous,
   heartbreaking, in grief, joyless, lamentable, lugubrious,
   miserable, mournful, moving, painful, pathetic, piteous, pitiable,
   plaintive, plangent, plunged in grief, poignant, regrettable,
   rueful, ruthful, sad, saddening, sharp, sore, sorrowed, sorrowful,
   sorrowing, tearful, touching, uncomfortable, woebegone, woeful,
   wretched