The term "double-faced" refers to someone who is deceitful and hypocritical. Some synonyms for this word include two-faced, false-hearted, duplicitous, insincere, disingenuous, and hypocritical. These words all suggest that someone is not genuine in their behavior or intentions and has a tendency to act in an opportunistic or deceptive way. Other synonyms for double-faced include devious, treacherous, untrustworthy, and deceitful, which all imply that a person is willing to betray others for their own gain. Whatever the word used, someone who is double-faced is someone who cannot be trusted, and it is important to be aware of their true intentions in order to avoid being misled or hurt by them.