Over-sentimental is a term used to describe something that is excessively emotional or sentimental. Some synonyms for over-sentimental are saccharine, mawkish, maudlin, sentimental, cloying, syrupy, sappy, treacly, mushy, and gooey. These words describe something that is overly sweet or emotional, and often seen as insincere or contrived. When used to describe a person, it implies that they are overly emotional or sentimental, and may be seen as lacking in authenticity. It is important to use these words carefully as they may be perceived as negative by some people, while others may appreciate them.