What's the best way to make a bully understand how horrible his behaviour is?

In my life, bullying has always been a thing i was in touch with and i was the target of. In my opinion, apart from very little cases of Bullying caused from kids with troublesome families, there is no such way to deal with words, with a violent bully. And i have always witnessed Parents underestimating this problem. My choice in life was to take Martial arts training, which helped me in Many more ways other than dealing with aggression. That's my advice if YOU are the target. If you are not, in my opinion the best way to make him understand his behaviour is putting him in front of the fact that he is major cause of psychological issues. But This is utopistic, since in the most cases i have seen, bullies have the rest of the class on their side, Hardly there is anyone to stand against them. Take up martial arts, gain confidence, and show him the way of bushido ;)

Having the people the bully is trying to impress tell him so! Once he realizes he's lost the admiration he so dearly covets, he'll rethink his strategy.

It depends on the bully, but generally if he's bullying in the first place, he understands that it's hurtful and that's WHY he's doing it. He WANTS to hurt someone, or at least dominate someone without their consent. If someone's just being overbearing without any intent to harm, they're not actually bullying, and you may be able to explain to them that they're doing damage.

Asking them directly, face to face, if they know what they are doing to you. Explaining, if it's possible, in a calm way, how you are feeling and what his actions affect. Sometimes this can be a way to stop them from doing what they are doing.

Sadly, I don't think they'll ever know unless they have kids of their own and those kids are being bullied. Giving them a "taste of their own medicine" definitely isn't going to be helpful, and is going to fuel them even more. If they are still in High School, or College, it still may take a couple of years for them to realize how bad they are, and have done. Hopefully the bully will mature enough in due time.

try talking to the person face to face , tell a professional what is going on ,you cant always make a bully understand how their behaviour is effecting you.The bully may be trreating you in a certain way as they may have low self esteem

Well when I was young I got someone who was bigger to pick on the bully it worked But it was not the best way to deal with it

Let them know that there is a better way to go about things instead of bullying those who can't help themselves

Perhaps if you can, ask him how he would feel if someone treated someone he loved the way he treats others. How would he feel if someone treated his mother, his little sister, his older brother, his father, girlfriend, boyfriend, anyone he loved the way he treats you. Chances are, he'd be pretty angry about it. This would be a decent step to helping him to understand what's wrong.

You can Start by writing a letter telling he or she how you truly feel without being rude or aggressive. Allow he or she to better understand your situation and how you are. Tell them you are willing to be friends and if friends is too great of a thing you would be ok with acquaintances but as long as he or she can allow you to feel like how a human being would like to be felt. Like how he or she would like to be felt.