"Up to par" is an idiomatic expression which means something is meeting a standard or level of expectation. There are a number of synonyms for this phrase, including "adequate," "acceptable," "satisfactory," "competent," "acceptable," and "suitable." Other useful synonyms might include "adept," "skilled," "capable," "fitting," "standard," and "proficient." Depending on the context in which it is used, one synonym may be more appropriate than another. For instance, "competent" might be more appropriate to describe a person's skills or abilities, while "acceptable" might be better suited to describe the quality of a product or service. Regardless, these synonyms convey the same basic idea: something is meeting a standard of quality or performance.