Don't be such a party pooper, let's have some fun!
killjoy
Frequency:
70
%
She always finds a way to rain on our parade, what a killjoy.
buzzkill
Frequency:
60
%
His negative attitude was a real buzzkill for the group.
spoilsport
Frequency:
50
%
Don't be a spoilsport, let's enjoy the game.
Idiomatic Expressions for wet blanket
Phrase: Throw a wet blanket on something
Meaning: To spoil or ruin a positive or exciting situation.
Usage: She always finds a way to throw a wet blanket on our plans.