complete or total (used as an intensifier--typically when stressing how bad something is)
The man sat huddled up in his chair, with his head sunk upon his breast, like one who is utterly crushed.
On the other hand, he had no means of supporting himself, and his father, who was by all accounts a very hard man, would have thrown him over utterly had he known the truth.
Good has come out of evil, however, for the barmaid, finding from the papers that he is in serious trouble and likely to be hanged, has thrown him over utterly and has written to him to say that she has a husband already in the Bermuda Dockyard, so that there is really no tie between them.
I have thought sometimes that it was the disposition of her child which weighed upon her mind, for I have never met so utterly spoiled and so ill-natured a little creature.
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.
The Coroner: How was it, then, that he uttered it before he saw you, and before he even knew that you had returned from Bristol?
That was the word the man uttered, and of which his son only caught the last two syllables.
Suddenly, without any preliminary sound in the midst of the utter stillness, the door of my room swung slowly open.
The instant that I uttered the words I regretted the rashness of my speech.
She came to Mr. Doran’s door just after we returned, and she endeavoured to push her way in, uttering very abusive expressions towards my wife, and even threatening her, but I had foreseen the possibility of something of the sort, and I had two police fellows there in private clothes, who soon pushed her out again.