Stunner (noun)

1. A person or thing that stuns.
2. A very attractive person.

Origin:

The word "stunner" originates from the verb "stun" which means to render unconscious or insensible, especially by a blow.

Examples:

1. The new sports car is a real stunner.
2. She was a stunner in that red dress.
3. The boxer was knocked out by a stunner of a punch.
4. The magician pulled off a stunner of a trick.
5. He was a real stunner, one of the most beautiful men she had ever seen.