n. spoilsport, damper, dampener, grouch, grump, malcontent, pessimist, cynic, prophet of doom, Cassandra, Colloq wet blanket, sourpuss, US party pooper, gloomy Gus, picklepuss: Go to the dance and stop being such a killjoy!
KILLJOY
Meaning of KILLJOY in English
Oxford thesaurus English vocab. Английский словарь Оксфорд тезаурус. 2012