When it comes to describing a person or situation that is completely honest and transparent, the phrase "open and aboveboard" is often used. However, there are several synonyms that can be used to convey the same meaning. One option is "forthright," which implies a willingness to be honest and direct. Another alternative is "frank," which suggests a straightforward manner of speaking. "Transparent" is also a good option, indicating clarity and openness. Finally, "candid" is a synonym that suggests a willingness to speak the truth, even if it may be uncomfortable or unpopular. Regardless of the exact word used, these synonyms all convey the idea of honesty and straightforwardness.