Cloysome is an adjective that describes something that is cloying or excessively sweet or sentimental. While there are not many direct synonyms for this word, there are several phrases and other words that can convey a similar meaning. For example, something that is overly sentimental could be described as saccharine or mawkish. If something is excessively sweet or rich, it could be described as cloying, sickly, or overly indulgent. Other synonyms for cloying could include nauseating, overpowering, or overwhelming. Ultimately, the best synonym will depend on the context in which the word is used and what exactly is being described.