nonparticipant
noncooperator
nonmember
nonattendee
nonparticipating
nonparticipator
nonresponder
nonpartisan
neuter
baulker
noncompliant
balker
nonvoter
inactive
exile
expatriate
expat
off board
uneligible
non partant
absentee
unparticipating
nonsharer
noneligible
nonsignatory
non-relative
nonattender
observer
nonqualifier
forgoer
nondelegate
opt out
crasher
nonadherent
nonjoiner
nonsigner
stayaway
AWOL
ineligible
lookers-on see most of the game
non-responder
forfeit
nonrecipient
per procurationem
nondriver
disqualification
nonparticipation
unsociable
serononresponder
silent person