Cloying

Something that in small doses is desirable or pleasant, however in large doses becomes disgusting. Deserts that are overly sweet are described as cloying since they would be delicious if they contained less sugar. The judges on the Food Network show "Chopped" use the terms "cloying" or "cloyingly sweet" to describe a repulsively sweet dessert. An example of a cloying dessert would be a sugar cookie with a frosting that used refined sugar, honey, powdered sugar, sweetened chocolate and high fructose corn syrup. One bite and you would need an insulin shot. This word can also pertain to people who are tolerable for short periods of time but become annoying and even repulsive if you have to spend an extended period of time with them. You say "hi" or smile as you pass them, but when they stop you to talk they become instantly cloying.