The antonyms for the phrase "are on team" can vary depending on the context. Generally speaking, if you're talking about being part of a group or team, antonyms could include "solo," "individual," or "soloist." If you're referring to someone being on the opposing team, antonyms could include "against," "opponent," or "adversary." Regardless of the context, antonyms for "are on team" typically signify a lack of unity or support for a common goal. However, it's worth noting that in some cases, not being part of a team can also have positive connotations such as being independent or self-sufficient.