Answer: spoilsport

AnswerCrossword Clue
SPOILSPORTKilljoy
SPOILSPORTStick-in-the-mud
SPOILSPORTWet blanket
SPOILSPORTWet blanket.
SPOILSPORTCousin of a wet blanket.
SPOILSPORTKill-joy.
SPOILSPORTPessimist's cousin.
SPOILSPORTWet blanket's cousin.
SPOILSPORTSaboteur on a petty level
SPOILSPORTKill-joy
SPOILSPORTCoddles wine
SPOILSPORTKill-joy runs harbor for ill-gotten gains
spoilsportone who spoils the sport or pleasure of others
spoilsportA person who behaves in a way that spoils others' pleasure, esp. by not joining in an activity