All 5 Uses

utter
in
The City of Ember
(Edited)

As they came to a halt in the middle of the street or stood stock-still in their houses, afraid to move in the utter blackness, they were reminded of something they preferred not to think about: that someday the lights of the city might go out and never come back on.
p. 5.1

utter = complete
Behind it was a space of utter darkness.
p. 186.6 *
Lina stood utterly still.
p. 223.6

utterly = completely or totally
It was strange to be out in the city with the streets so utterly deserted.
p. 226.8
The creature was utterly strange, not like anything they had ever known, and yet when it looked at them, some kind of recognition passed between them.
p. 267.4

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.