Nonparticipating (adjective)

Not taking part in an activity or event.

Origin:

Derived from non- (meaning 'not') and participating (meaning 'taking part in an activity or event').

Examples:

1. The nonparticipating students watched the game from the sidelines.
2. She was a nonparticipating observer at the meeting.
3. The nonparticipating countries declined to send athletes to the competition.
4. The nonparticipating member of the band refused to join in the encore.
5. Despite being invited, the nonparticipating guests declined to attend the party.