The term "unfranker" is rarely used in the English language. However, there are several synonyms that one can use instead, including dishonest, deceitful, fraudulent, insincere, underhanded, unethical, and disingenuous. Each of these words carries a slightly different connotation but implies a lack of honesty or sincerity. For instance, "dishonest" suggests a deliberate attempt to mislead others, while "insincere" indicates a lack of authenticity. "Underhanded" and "unethical" both suggest a willingness to engage in unethical behavior to achieve an end. In situations where "unfranker" might be used, there are several synonyms available, each with its own unique nuances of meaning.