What is the most polite way to uninvite someone to a party?

First, there is never a polite way to uninvited someone to a party once you have invited them. That said, your friend has engaged in one of the most egregious breaches of etiquette, which is to invite/bring an uninvited guest. One just does not do that, ever, under any circumstances. They may ask the host if they can bring a friend, but even that's kind of iffy.

If you already told your friend it was okay, there's a problem. If your friend merely announced that s/he is bringing someone, you should speak up and say that the invitation was only extended to them, and you intend to stick with those you have directly invited. At that point they can decide whether to still come, or they may extend their regrets and go play with their other friend. It's your party.

There is no polite way to uninvite someone to a party. It's very important to monitor who gets invited to your party. After all it's your party and you should have told your friends to let you know who they are inviting so that you could make sure the people coming to your party are people you want there. However, if you don't want the person there bad enough then I am sure that you will find a way let them know that they are not wanted.

There really is no polite way to do that. I would probably just bite my tongue on that situation. The best thing you can do is let your friend know you don't really like him or her and that next time to not invite them when you throw a party.

Or you could make your party in such a way that you invite people only and if people want to bring others they gotta ask you first.

If the person does something you find rude or annoying at your party, then feel free to kick them out. It is your party and you don't have to put up with anyone's bad behavior.

Hey, dumbhead, if the poor person never did anything bad 2 u howcome u don't like them? Look, the best thing to do in ur stupid case is to make this person turn down the possibility of coming to your party. Really, there's no polite way to say, hey do u know that party my pal invited u to... well u know,seeing as i don't like you, even though you've never done anything wrong, i am now officialy uninviting u. But don't worry, u did nothing wrong... It's not u, it's me....

STILL THINK U SHOULD LET THEM COME 2 UR PARTY.

Ask your friend why they invited the person. It could be that they needed a place to go and have some fun just like everyone does at times. Trust that the friend that they bring is as good as your friend. and have a good party.

There is no such thing as being polite in this situation. If you don't like that person then just tell her/him not to go to your party. I know that that person did nothing wrong, but at least you will be comfortable that day of your party.

Have fun.

There is no polite way to uninvite them. It would alienate your friend who invited them and the uninvited guest. Maybe you can put up with this person for a few hours? It's easy to politely ignore someone.

You cannot be polite and do this. You could tell your friend he did not have the right to invite, and let him un-invite, which probably means you'd insult two people. Or just let him come, what's the big deal with one extra person.

Well typically you would ask the friend who invited the other person to ur party because you just tell him tht he didnt hv any right to invite someone else.... Unless u said so... You just tell the other person tht "I'm sorry to tell you that you cant come to the party because I'm cant invite any1 anymore." Sorry... Leave really fast... Jk abt the running

Pretend to be sick and tell them you're canceling the party. Try: "Hey I have a fever so the party is cancelled this year." Chances are they might not show up. But don't mention anything about it to them as this can create drama. Good luck!