Janus-faced is a term that describes someone who pretends to be friendly but is actually insincere, or someone who has two faces, one that is good and another that is bad. Some antonyms for this term include dependable, reliable, trustworthy, sincere, genuine, and authentic. These words describe individuals who are honest, transparent, and who do not hide their true intentions. They are the opposite of people who are deceitful, cunning, and manipulative, and they can be relied upon to do what they say they will do. It is important to be aware of individuals who are janus-faced and to seek out those who are authentic and trustworthy.