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"cheerfully" is also used as a crossword clue. If that's what you saw, the answer is often merrily (7 letters).
Definitions
in a cheerful manner
Word origin
From Middle English cherefully; equivalent to cheerful + -ly.
Used in a sentence
“'Well, what have you done this time?' asked Sebastian cheerfully.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“With good spirits”10 letters
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