When describing something as "of poor quality", there are a number of synonyms that can be used to convey the same meaning. For example, you might describe something as shoddy, subpar, mediocre, or inferior. Alternatively, you could use words like substandard, defective, faulty, or shabby to describe something that is not up to standard. Other synonyms for poor quality could include unexceptional, unsatisfactory, and low-grade. By choosing the right synonym for the situation, you can convey exactly what you mean without resorting to cliches or vague language.