There are many synonyms for the phrase "more third-rate," which can be used to describe something that is of lower quality or inferior compared to other things of the same type. Some synonyms include subpar, mediocre, shoddy, inferior, low-grade, second-rate, and below average. Other words that can be used to describe something that is not up to par include deficient, unsatisfactory, inadequate, and lower-quality. Additionally, terms like unprofessional, unpolished, amateurish, and poorly executed can also be used to describe something that is more third-rate in nature. When a product, service, or performance is described as more third-rate, it typically means that it falls short of expectations or standards.