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.
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            You take me in too dolorous a sense;
            I spake to you for your comfort.      --Shak.
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   2. Occasioning pain or grief; painful.
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            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.
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