The term "are with it" can imply being up-to-date or knowledgeable about modern trends and culture. Its antonyms, then, could be outdated, obsolete, or uninformed. Being disconnected or detached from present-day ideas and developments would also be appropriate antonyms. In contrast, staying current and well-informed could be expressed through synonyms such as trendy, modern, or hip. Failing to be "with it" may indicate a lack of adaptation or an unwillingness to move with the times. Whether used in casual conversation or more formal settings, these antonyms offer a clear juxtaposition to the idea of staying "with it".