The antonyms for the word "more nonparticipating" could be words such as engaged, involved, active, participating, or inclusive. Whereas the word "nonparticipating" implies a lack of involvement or participation in something, the antonyms suggest the opposite. To be engaged or active means to take an active role or interest in something, while being inclusive means to include everyone in the conversation or activity. Therefore, if someone is described as "more nonparticipating," it means that they are becoming increasingly disengaged or uninvolved. Conversely, if someone is more involved, they are likely to be more committed and engaged in the topic or activity.