All 4 Uses

utter
in
Harry Potter (#2) and the Chamber of Secrets
(Edited)

But to Harry's and Ron's utter amazement, stage one of the operation went just as smoothly as Hermione had said.
p. 214.4 *

utter = complete or total
Hermione lay utterly still, her eyes open and glassy.
p. 257.4

utterly = completely or totally
Lockhart was standing well back, a look of utter terror on his face.
p. 300.1

utter = complete or total
He turned around to the Weasleys, who were looking utterly bewildered.
p. 329.4

utterly = completely or totally

Definitions:

(1) (utter as in: utter stupidity)
complete or total (used as an intensifier--typically when stressing how bad something is)
(2) (utter as in: utter a complaint)
say something or make a sound with the voice
(3) (meaning too rare to warrant focus)
Less commonly, and archaically, utter can mean to let out.