The word "un-franker" refers to someone or something that is not honest or sincere in their actions or words. Some synonyms for this term include insincere, disingenuous, deceitful, untruthful, dishonest, and false. Each of these words describes a person or situation where there is a lack of transparency or authenticity. In contrast, antonyms for un-franker include genuine, sincere, honest, truthful, and straightforward. These words are often used to describe individuals who are transparent and authentic in their actions and interactions with others. Therefore, it is important to use appropriate synonyms and antonyms to describe people and situations accurately.