Cloyingness refers to something that is overly sweet or sentimental to the point of being unpleasant. Synonyms for this word include sickly, saccharine, syrupy, mawkish, overbearing, and overwhelming. These words describe the sensation of feeling overwhelmed by something that is too much. Cloyingness can be used to describe anything from a romantic gesture to a sentimental movie. It can also be used to describe a certain type of food, such as a dessert that is too sweet or rich. Overall, cloyingness is best avoided as it can quickly become cloying and unpleasant, leaving a bad taste in one's mouth.