Source : Webster's Revised Unabridged Dictionary (1913)

Sentimental \Sen`ti*men"tal\, a. [Cf. F. sentimental.]
   1. Having, expressing, or containing a sentiment or
      sentiments; abounding with moral reflections; containing a
      moral reflection; didactic. [Obsoles.]

            Nay, ev'n each moral sentimental stroke, Where not
            the character, but poet, spoke, He lopped, as
            foreign to his chaste design, Nor spared a useless,
            though a golden line.                 --Whitehead.

   2. Inclined to sentiment; having an excess of sentiment or
      sensibility; indulging the sensibilities for their own
      sake; artificially or affectedly tender; -- often in a
      reproachful sense.

            A sentimental mind is rather prone to overwrought
            feeling and exaggerated tenderness.   --Whately.

   3. Addressed or pleasing to the emotions only, usually to the
      weaker and the unregulated emotions.

   Syn: Romantic.

   Usage: {Sentimental}, {Romantic}. Sentimental usually
          describes an error or excess of the sensibilities;
          romantic, a vice of the imagination. The votary of the
          former gives indulgence to his sensibilities for the
          mere luxury of their excitement; the votary of the
          latter allows his imagination to rove for the pleasure
          of creating scenes of ideal enjoiment. ``Perhaps there
          is no less danger in works called sentimental. They
          attack the heart more successfully, because more
          cautiously.'' --V. Knox. ``I can not but look on an
          indifferency of mind, as to the good or evil things of
          this life, as a mere romantic fancy of such who would
          be thought to be much wiser than they ever were, or
          could be.'' --Bp. Stillingfleet.

Source : WordNet®

sentimental
     adj 1: given to or marked by sentiment or sentimentality
     2: effusively or insincerely emotional; "a bathetic novel";
        "maudlin expressons of sympathy"; "mushy effusiveness"; "a
        schmaltzy song"; "sentimental soap operas"; "slushy
        poetry" [syn: {bathetic}, {drippy}, {hokey}, {maudlin}, {mawkish},
         {mushy}, {schmaltzy}, {schmalzy}, {slushy}]