Antonyms for the word "nonparticipating" denotes the opposite meaning of not being involved or taking part in something. The terms that can be used include 'engaging', 'participating', 'involved', 'active', 'partaking', and 'contributing'. These words define the participation or involvement of an individual in any activity, event or process. The antonyms convey a sense of enthusiasm, interest, and involvement in what is happening around them. They signify eagerness to share ideas, opinions, and knowledge and be a part of something that is beneficial, productive and fulfilling. Unlike nonparticipating, these words indicate the presence and contribution of an individual towards a collective or individual goal.