stunner

/ˈstʌnər/
noun
  1. A person or thing that is extremely attractive or impressive.
    • The sunset over the ocean was a real stunner.
    • She was a stunner in her elegant evening gown.
    • The new sports car is an absolute stunner.
  2. A surprising or shocking event or piece of news.
    • The team's last-minute win was a stunner.
    • The election result was a stunner for everyone.
    • The announcement of the merger was a stunner to the employees.