That bejeweled cumberbund with his tuxedo is just stunning!
That tuxedo complements his stunning good looks rather nicely.
This is how you use the word "stun" in a sentence.
Her incomparable skill was stunning.
These fields of flowers are stunning.
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 boy was hasty.
the boy was dietary
the angrily boy said a bad word.
"he chided the boy for his laziness"
That boy is really inventive
the boy dodged in a garden
that boy is very rude