the man built a stunning device for the future
In the <b>sentence</b>, "It was stunning sex." 'stunning' is appropriate but the <b>sentence</b> itself is awkward. A better suited <b>sentence</b> with the same meaning would be, "The sex was stunning."
"That dress is simply stunning"
The reflection of the sunset in the pond was really quite stunning.
My family came from the Scottish Highland.
This is how you use the word "stun" in a sentence.
As a verb. e. g. I was stun by the amazing graphics of "Battlefield 3".
That bejeweled cumberbund with his tuxedo is just stunning! That tuxedo complements his stunning good looks rather nicely.
Her incomparable skill was stunning.
These fields of flowers are stunning.
When we were mining in a dark cave, we found some amethyst.
My grandmother's engagement ring featured a lovely rhodolite garnet.
To me, the Canyon was a stunning place.