kill-joy

She was an iceberg,—a beautiful kill-joy,—a wet blanket of charming texture.

“Oh, stop being a kill-joy,” Laura commanded, giving her a little shake.

That old kill-joy at Paddington knew what he was talking about!

Mr. Pussyfoot Johnson has told a Glasgow audience that he is no kill-joy, but smokes cigars.

To have one's self always on one's mind is to lodge a kill-joy; to act always from calculation is a sure path to blunders.