Honest and aboveboard are two words that describe a person who is trustworthy and transparent. There are plenty of synonyms that can be used to describe these qualities. Trustworthy, reliable, candid, sincere, forthright, and truthful are all excellent synonyms for honest and aboveboard. These words all convey a sense of integrity and fairness, along with a commitment to being open and truthful in all dealings. Other synonyms for honest and aboveboard include transparent, open, straightforward, and frank. These words all convey a sense of clarity and transparency, indicating that a person is upfront and honest about their intentions and their actions.