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"utterly" is also used as a crossword clue. If that's what you saw, the answer is often supremely (9 letters).
Definitions
completely and without qualification; used informally as intensifiers
Word origin
From utter + -ly.
Used in a sentence
“Well, now we are utterly lost.”
“I have failed you utterly.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Without reservation”7 letters
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