in an utter manner; completely; absolutely.

1175–1225; Middle English; see utter2, -ly

entirely, fully, wholly, totally.
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utterly (ˈʌtəlɪ)
(intensifier): I'm utterly miserable

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
As for the daughters-they've been completely awol, utterly useless.
Perhaps this is best exemplified by the utterly mundane treatment of squirrel.
The state has failed utterly and rival militias vie for control.
Apparently identical cancers in two patients may behave so unlike as to appear
  utterly different diseases.
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