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