third-wheel
Couple's unwanted companion
A third wheel is someone who accompanies a couple, feeling awkward or superfluous to their intimacy: I felt like a third wheel on their date.
The image is of a useless wheel on a bicycle—two work perfectly, three is excess.
As a verb, to third-wheel is to be in that position: I ended up third-wheeling all night.
Acidic berry for preserves
- tagalongUninvited companion
- wallflowerShy person avoiding socializing
- outsiderOne excluded from group
- spectatorObserver at an event
bystander · lonely · lonesome · uncomfortable · alienated · disconnected · isolated · misfit
One who enters uninvited
- buttinskyIntrusive meddler in others' affairs
- meddlerOne who interferes uninvited
- intruderUnauthorized person present
- uninvitedWithout formal welcome
interference · encroachment · interrupter · gatecrasher · crasher · nuisance · disruptive · obtrusive
Amount exceeding requirement
- extraAdditional, beyond necessary
- unnecessaryNot essential or required
- redundantExceeding what's needed
- superfluousExceeding what suffices
dispensable · unneeded · excess · spare · unwelcome · uninvited · unessential · inessential
gooseberry
Acidic berry for preserves
- tagalongUninvited companion
- wallflowerShy person avoiding socializing
- outsiderOne excluded from group
spectator · bystander · lonely · lonesome · uncomfortable · alienated · disconnected · isolated · misfit · spare
interloper
One who enters uninvited
- buttinskyIntrusive meddler in others' affairs
- meddlerOne who interferes uninvited
- intruderUnauthorized person present
uninvited · interference · encroachment · interrupter · gatecrasher · crasher · nuisance · disruptive · obtrusive · invasive
surplus
Amount exceeding requirement
- extraAdditional, beyond necessary
- unnecessaryNot essential or required
- redundantExceeding what's needed
superfluous · dispensable · unneeded · excess · spare · unwelcome · uninvited · unessential · inessential · expendable
third-wheelinsider
One with confidential access
integral part · VIP · included · indispensable · life of the party
third-wheelpartner
One who shares activity
couple · significant other · better half · taken · romantic partner
third-wheellife of the party
Most entertaining guest
center of attention · host · main attraction · star · ringleader
third, wheel, thirds, wheels, wheeled, wheeling, wheeler, three, thrice