showstopping

adj

1. Characteristic of a showstopper; breathtaking.

   ““You look absolutely showstopping. I hope you know that.” “Showstopping, is it? That's a new one.””

   “14 Showstopping Desserts That Don’t Require a Mixer [title]”

2. Critical; major.

   “There is a school of thought that says you should periodically fix these issues ahead of the showstopping bugs.”