The term "fixt up with" implies that someone has been provided with accommodations or a partner. The opposite of this expression would be to be left without, to have been abandoned or rejected. Other antonyms could include "isolated," "neglected," "unwanted," "unattached," "disconnected," and "unaided." These terms convey a sense of disconnection and loneliness, suggesting that someone is without support or companionship. In contrast, "fixt up with" implies a sense of belonging and being cared for, suggesting that someone has been given a place to call home or has been matched with a partner who is compatible with them.