killjoy \ˈ ̷ ̷ˌ ̷ ̷\noun Etymology:kill (I) + joy : one that inspires gloom or counteracts joy or high spirits : one that tends to pessimism or a depressing solemnness especially among people that are happy or optimistic : one that dispirits < professional killjoys whose chief fear it is that people … might get some fun out of life — T.P.Whitney >