The Collaborative International Dictionary of English v.0.48:

Remorseful \Re*morse"ful\ (-m?rs"f?l), a.
   1. Full of remorse.
      [1913 Webster]

            The full tide of remorseful passion had abated.
                                                  --Sir W.
                                                  Scott.
      [1913 Webster]

   2. Compassionate; feeling tenderly. [Obs.] --Shak.
      [1913 Webster]

   3. Exciting pity; pitiable. [Obs.] --Chapman.
      [1913 Webster] -- Re*morse"ful*ly, adv. --
      Re*morse"ful*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

remorseful
    adj 1: feeling or expressing pain or sorrow for sins or offenses
           [syn: contrite, remorseful, rueful, ruthful]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "remorseful":
   anxious, apologetic, ashamed, bad, bitter, compunctious,
   conscience-smitten, conscience-stricken, contrite, embarrassed,
   full of remorse, guilty, humbled, humiliated, mortified, penitent,
   penitential, regretful, repentant, repining, rueful, self-accusing,
   self-condemning, self-convicting, self-debasing, self-flagellating,
   self-humiliating, self-punishing, self-reproaching, shamed,
   shamefaced, shamefast, shameful, sorrowful, sorry, unhappy about,
   wistful, woeful