Excessively fond of or enthusiastic about (something).
Foolishly or unreasoningly fond of, attracted to or in love with (someone).
Excessively sweet in action or disposition, especially if romantic or sentimental to the point of ridiculousness; sickly sweet, syrupy.
Resembling granulated sugar; saccharoid.
Of or relating to saccharin (“a white, crystalline powder, C₇H₅NO₃S, used as an artificial sweetener in food products”).
Sentimentalism.