killjoy, spoilsport, party pooper, dampener, buzzkill, drag, downer, fun-sucker, wet rag, stick-in-the-mud, grouch, grump, moaner, complainer, sourpuss, naysayer, pessimist, defeatist, cynic
killjoy, spoilsport, party pooper, dampener, buzzkill, drag, downer, fun-sucker, wet rag, stick-in-the-mud, grouch, grump, moaner, complainer, sourpuss, naysayer, pessimist, defeatist, cynic