Contrarily, what do you call friends who are either very deceiving or selfish? A "false friend," perhaps?

Native speaker’s answer
Rebecca
Close! It's common to call someone a "fake friend". This is when a friend is only friends with you for their own benefit, which could involve being deceiving or selfish. Ex: I didn't realise I had such fake friends. They pretend to be my friend, and then they talk dirt about me. Ex: I don't have time for fake friends in my life.