Without pausing to think, he aimed high at the spider’s underbelly... and shouted "Stupefy!’
"STUPEFY!" roared twenty voices — there was a blinding series of flashes and Harry felt the hair on his head ripple as though a powerful wind had swept the clearing.
Moody raised his wand, he opened his mouth; Harry plunged his own hand into his robes "Stupefy!"
Without pausing to think, he aimed high at the spider’s underbelly, as he had done with the skrewt, and shouted "Stupefy!"just as Cedric yelled the same thing.
He could hear Cedric yelling "Stupefy!" too, but his spell had no more effect than Harry’s — Harry raised his wand as the spider opened its pincers once more and shouted "Expelliarmus!"
Stupefy!" they shouted in unison, and the Stunning Spells shot into the darkness like fiery rockets, bursting in showers of stars on the dragons’ scaly hides Harry watched the dragon nearest to them teeter dangerously on its back legs; its jaws stretched wide in a silent howl; its nostrils were suddenly devoid of flame, though still smoking — then, very slowly, it fell.
There are no more uses of "stupefy" in the book.
Show samples from other sources
The lawyer said his client was stupefied by the accusation.
She was shocked—too stupefied to respond for a few seconds.