complete or total (used as an intensifier--typically when stressing how bad something is)
It’s utter nonsense, if Dumbledore needed work doing, he had the whole Order at his command!
"I personally would be utterly bamboozled by all those buttons and knobs," said Dedalus.
The Dursleys, who had listened to all of this with looks of utter incomprehension on their faces, jumped as a loud voice screeched, "Hurry up!"
"Yes, they’re here," said Hermione, and to Harry and Ron’s utter astonishment, she pulled out a pair of jeans, a sweatshirt, some maroon socks, and finally the silvery Invisibility Cloak.
"The — the what?" asked the wandmaker, looking utterly bewildered.
"Oh, Harry," she said wearily, "it’s a pile of utter rubbish."
Hermione looked utterly bewildered, but to Harry’s enormous relief she accepted the bizarre turn of events without comment.
But to be sure, to be utterly sure, he must return to each of his hiding places, he must redouble protection around each of his Horcruxes…
Harry left her floating there, looking utterly bewildered.
Malfoy fell backward on top of the Death Eater, his mouth bleeding, utterly bemused.
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Snape looked utterly perplexed.
Happiness seemed to radiate from Dumbledore like light; like fire: Harry had never seen the man so utterly, so palpably content.
She sat up a little straighter "Potter, it was madness, utter madness, for you to enter this castle-"
Hermione’s screams echoed off the walls upstairs, Ron was half sobbing as he pounded the walls with his fists, and Harry in utter desperation seized Hagrid’s pouch from around his neck and groped inside it: He pulled out Dumbledore’s Snitch and shook it, hoping for he did not know what — nothing happened — he waved the broken halves of the phoenix wand, but they were lifeless — the mirror fragment fell sparkling to the floor, and he saw a gleam of brightest blue — Dumbledore’s eye was…
There are no more uses of "utter" identified with this meaning in the book.
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She suffered utter devastation when her child died in the accident.