Double-crossed means to deceive or betray someone who trusted you. There are a number of synonyms for this term that are commonly used. Some of the synonyms for this word include betrayed, cheated, conned, tricked, duped, hoodwinked, and swindled. These words all carry a similar connotation of being deceived or betrayed by someone they thought they could trust. Whether it's in a personal or professional setting, being double-crossed can feel like a betrayal of the worst kind. It's important to be cautious when trusting others and to be aware of any potential warning signs that may indicate someone is not as trustworthy as they seemed.