Oversweet is a word that could be used to describe something that is excessively sweet or sugary. However, if you are looking for alternatives to this word, there are several synonyms you can use. For example, you could say that something is cloyingly sweet, saccharine, sickly sweet, or overly sugary. Alternatively, you might describe something as too sweet to the point of being unpleasant, or simply as excessively sweet or syrupy. Regardless of which synonym you choose, they all convey the idea that something is overly sweet, and may not be to everyone's taste.