Judas kiss, also known as a betrayal kiss, refers to a kiss given by someone who is pretending to be friendly but has an ulterior motive to harm the other person. There are various synonyms for Judas kiss, such as double-cross, backstabbing, betrayal, treachery, disloyalty, deception, and perfidy. All of these words describe the act of betraying someone's trust, often in a deceitful and sneaky manner. Whether it's in personal or professional relationships, being betrayed with a Judas kiss can be a deeply hurtful experience. It is important to be aware of the signs and be cautious of people who may not have our best interests at heart.