Frank is a word used to describe someone who is straightforward and honest in their approach. However, there are several other words that can be used as a synonym for frank. These include candid, sincere, upfront, direct, open, plainspoken, straightforward, honest, genuine, unreserved, forthright, transparent, and unambiguous. All of these words encompass the idea of someone who is open and honest in their communication, without any hesitation or doubt. Whether you need to describe someone's personality or a specific interaction, these synonyms for frank will help you to better communicate your message.