The phrase "are party to" means to be involved or to participate in something. The antonyms of this phrase could be "are not involved," "are not a party to," "are not privy to," or "are not included." These antonyms denote exclusion from an activity or event. For instance, if someone says "I am party to a business meeting," it means that the person is involved in the meeting. In contrast, if someone says "I am not a party to a legal dispute," it means that the person is not involved or has no interest in that dispute. Antonyms of "are party to" can clarify the exclusion, and showcase the boundaries of participation or involvement.