Antonyms for the phrase "are joined with" might include "are separated from," "are disengaged from," "are detached from," or "are unconnected with." These antonyms imply a lack of connection or unity between two things or entities. For example, if two pieces of fabric are joined together, their antonym would be that they are separated or disengaged from each other. Similarly, if two people are joined in a common goal or purpose, their antonym might be that they are unconnected with each other, or disengaged from their shared purpose. Considering antonyms can help to broaden our understanding of a word or phrase and its range of meanings.