The Collaborative International Dictionary of English v.0.48:
Sentimentalist \Sen`ti*men"tal*ist\, n. [Cf. F. sentimentaliste.] One who has, or affects, sentiment or fine feeling. [1913 Webster]WordNet (r) 3.0 (2006):
sentimentalist n 1: someone who indulges in excessive sentimentality [syn: sentimentalist, romanticist]