What's "be convinced" mean?

Native speaker’s answer
Rebecca
To be "convinced" means to be certain of something and that you can't easily be persuaded to think differently. It can also mean to be persuaded to do something. Ex: I'm convinced that ghosts are real. Ex: Her friends convinced her to go on the ski trip with them. => persuaded Ex: Terry was convinced that Luna would say no to going out with him if he asked.