There are many synonyms for the phrase "beyond reproach" which means something that is free from any fault or criticism. Some of these synonyms include "impeccable", "flawless", "perfect", "untarnished", "immaculate", "unblemished", "faultless", "irreproachable", and "incorruptible". These words all convey the same meaning of something being of the highest possible quality or standard, without any flaws or errors. Whether referring to a person's character, actions, or performance, these synonyms all suggest that the individual or thing being described is of the utmost integrity and is beyond any possible criticism or reproach.