Antonyms for "carried on conversation" could be "remained silent," "ignored," "disregarded," "shut down," or "withdrew." In situations where someone is not interested in conversing, they might simply "tune out" or "detach" themselves from the discussion. Alternatively, individuals who are uncomfortable with conversing might "stutter" or "stammer," "mumble," or "ramble" incoherently. They could also "interrupt" or "talk over" others, preventing any real dialogue from occurring. Whatever the case may be, antonyms for "carried on conversation" typically involve a lack of engagement and often create tension or awkwardness in social settings.