Above reproach is a common phrase used to describe a person, behavior, or decision that is beyond criticism or suspicion. However, there are several other synonyms that can be used instead of above reproach, such as faultless, impeccable, irreproachable, unimpeachable, or blameless. These words convey similar meanings and are frequently used in professional or legal contexts to describe individuals who are beyond reproach and have the highest ethical standards. Additionally, these synonyms can also be used informally to describe a person's character or reputation, emphasizing their trustworthiness, reliability, and integrity.