Synonyms:
- Spectacularly ill-timed
- Clearing the room on arrival
- Killing the mood instantly
- A social hand grenade
- Impossible to ignore for all the wrong reasons
- Ruining the occasion
- Sending people running
- The definition of unwanted
- An uninvited disaster
- Bringing the party to a halt
- Socially radioactive
- A real crowd-repellent