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"splendidly" is also used as a crossword clue. If that's what you saw, the answer is often gloriously (10 letters).
Definitions
In an excellent, impressive, or very pleasing way.
Word origin
From splendid + -ly.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Wonderfully”10 letters
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