complete or total (used as an intensifier--typically when stressing how bad something is)
There, by reason of the great number of the damned, the prisoners are heaped together in their awful prison, the walls of which are said to be four thousand miles thick: and the damned are so utterly bound and helpless that, as a blessed saint, saint Anselm, writes in his book on similitudes, they are not even able to remove from the eye a worm that gnaws it.
There are no more uses of "utter" identified with this meaning, but check unspecified meaning below.
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She suffered utter devastation when her child died in the accident.
How could he utter in words to the priest what he had done?
He who utters it is more conscious of the instant of emotion than of himself as feeling emotion.
He thrust forward his under jaw and uttered a dry short cough.
Far away from there in some dark place he would murmur out his own shame; and he besought God humbly not to be offended with him if he did not dare to confess in the college chapel and in utter abjection of spirit he craved forgiveness mutely of the boyish hearts about him.
He had heard the names of the passions of love and hate pronounced solemnly on the stage and in the pulpit, had found them set forth solemnly in books and had wondered why his soul was unable to harbour them for any time or to force his lips to utter their names with conviction.
Every sense of the flesh is tortured and every faculty of the soul therewith: the eyes with impenetrable utter darkness, the nose with noisome odours, the ears with yells and howls and execrations, the taste with foul matter, leprous corruption, nameless suffocating filth, the touch with redhot goads and spikes, with cruel tongues of flame.
He gulped down the spittle in his throat as if he were gulping down the phrase and, fumbling at the peak of his tweed cap, turned to Stephen, saying: —Excuse me, sir, what do you mean by that expression you uttered just now?