The phrase "second rate" can be used to describe something that is of inferior quality or less desirable than something else. Synonyms for this phrase may include terms such as "inferior," "substandard," "mediocre," "average," or even "unremarkable." Other synonyms that may be used could include "low-grade," "second-class," "poor," or "shoddy." These terms may be used to describe a variety of things, from products or services to a person's performance or behavior. While some of these words may have a negative connotation, they can be useful for describing something that is simply not up to par or does not meet expectations.