killjoy

Don't be such a killjoy at the party.

She always plays the role of a killjoy in our group outings.

He's such a killjoy, always pointing out the negatives in everything.

Being a killjoy won't make you any friends.

The boss is a real killjoy, never allowing any fun at work.

Stop being a killjoy and let us enjoy ourselves.

She's such a killjoy when it comes to planning surprises.

Don't be a killjoy, let's try to make the best of this situation.

His negative attitude can really be a killjoy in social settings.

She's the ultimate killjoy, always ruining the mood with her complaints.