Chinfest is a slang term that refers to a conversation or gathering that is dominated by one person or a group of people who talk excessively. Antonyms for chinfest would include words and phrases like quiet, subdued, peaceful, calm, and serene. These terms suggest a lack of noise or chaotic chatter, which is the opposite of a chinfest. Other possible antonyms might include restrained, reserved, demure, or even introverted. These words describe individuals who are less likely to dominate a conversation or draw attention to themselves, which is very different from the behavior associated with a chinfest.