how to live together with one who don't want to see?

I would be very civil in facing her/him. I will answer her/his questions properly but I cannot miggle with her/him. Since I cannot stand having a long conversation with the person I don't want to talk to, as much as possible I would keep myself busy by talking to other people in the crowd or I would try to excuse myself as often as possible - such excuses will be I have to go to the restroom, I have to get something or I will just listen to my ipod. lol

I would excuse myself politely and leave. There is no reason to speak with someone you don't want to associate with. Maintain your manners and dignity and just leave.

aww.. my advice to you is.. don't hate that person.. cuz wat cud u do.. ur living with that person.. haha.. all he/ she cud do is make ur life miserable by just existing.. so.. learn to love that person..:) goodluck

If I rent a room in that house, I prefer to stay in my room. There might be some occasion where we'll eventually meet, I won't talk much in such situation. After completing what I want to do there, I would excuse myself politely and went back to my room. Basically I avoid contact since I might show how much I hate to be around, which is impolite.