The Collaborative International Dictionary of English v.0.48:

Sentimentality \Sen`ti*men*tal"i*ty\, n. [CF. F.
   sentimentalit['e].]
   The quality or state of being sentimental.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sentimentality
    n 1: falsely emotional in a maudlin way [syn: mawkishness,
         sentimentality, drippiness, mushiness, soupiness,
         sloppiness]
    2: extravagant or affected feeling or emotion