Double tongue refers to the act of speaking dishonestly. It is often used to describe people who tend to say one thing and do the opposite. The term double tongue has negative connotations and often implies a lack of integrity. Synonyms for double tongue include deceitful, false, insincere, two-faced, duplicitous, disingenuous, treacherous, hypocritical, and Janus-faced. All of these terms describe individuals who intentionally mislead others through their words and actions. It is important to recognize individuals who demonstrate these traits as they can have a negative impact on relationships and trust.