Schmaltziness is a term used to describe something that is overly sentimental or cheesy. There are numerous synonyms that can be used to describe this type of behavior or sentimentality. One such synonym is melodramatic, which is often used to describe behavior that is excessive or over-the-top. Another synonym is saccharine, which is used to describe something that is overly sweet or sentimental. Sentimental, mawkish, and corny are other terms that can be used to describe schmaltzy behavior or sentiments. Ultimately, the use of any of these synonyms will convey the same idea of something being excessively sentimental or cheesy.