showstopping

adjective2

1. •
   Characteristic of a showstopper; breathtaking.

   • “You look absolutely showstopping. I hope you know that.” “Showstopping, is it? That's a new one.” — 2014
2. •
   Critical; major.

   • There is a school of thought that says you should periodically fix these issues ahead of the showstopping bugs. — 2016