The term "having relation" implies a connection or a link between two or more things. The opposite of this idea would be an absence of any relationship or connection. Some antonyms for this phrase might include: unrelated, detached, unconnected, apart, disconnected, disengaged, or separate. These words suggest a sense of isolation or independence where no link or association exists. In some contexts, antonyms could also include phrases like: competing, conflicting, or antagonistic, which convey the notion of opposition or hostility between two entities. Overall, a range of antonyms exists for the term "having relation", depending on the particular context in which it is being used.