Antonyms for the phrase "being joined with" include "separated from", "disconnected from", "disengaged from", "united with", and "overlooked". Being separated from something means that it is no longer in contact or attached to it. Disconnected from means that it is no longer linked to it, while disengaged from suggests that the connection has been broken. United with, on the other hand, means being brought together with something, while overlooked can mean not being noticed or excluded from the connection. The most fitting antonym, however, would be "divorced from", meaning to be completely separated or disassociated from something.