saccharine

Short definition from Wiktionary

Adjective

1. 1
   Of or relating to sugar; sugary.
2. 2
   Containing a large or excessive amount of sugar.
3. 3
   Excessively sweet in action or disposition, especially if romantic or sentimental to the point of ridiculousness; sickly sweet, syrupy.
4. 4
   Resembling granulated sugar; saccharoid.
5. 5
   Of or relating to saccharin (“a white, crystalline powder, C₇H₅NO₃S, used as an artificial sweetener in food products”).

Noun

1. 1
   Something which is saccharine or sweet; sugar.
2. 2
   Sentimentalism.
3. 3
   Alternative spelling of saccharin.