The term "bandied with" refers to the act of exchanging words or ideas in a casual or frivolous manner. Some antonyms of this phrase include serious, formal, and solemn. Serious conversation involves thoughtful and intense discussion, while formal language is more structured and appropriate for formal occasions. Solemnity pertains to a serious and dignified behavior that reflects a deeply-held belief or conviction. Other antonyms of "bandied with" include respectful, somber, and reverent, all of which suggest a more cautious and thoughtful approach to communication. Ultimately, the choice of antonym will depend on the context in which the phrase appears and the desired tone or purpose of the conversation.