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"completely" is also used as a crossword clue. If that's what you saw, the answer is often thoroughly (10 letters).
Definitions
Entirely; in every way.
Word origin
From complete + -ly.
Used in a sentence
“Please completely fill in the box for your answer, using a number “2” pencil.”
“I will have completely finished my degree by next July, when my thesis has been properly edited.”
“It should not have been omitted that previous to completely stripping the body of the leviathan, he was beheaded.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Entirely”10 letters
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