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"lawfully" is also used as a crossword clue. If that's what you saw, the answer is often legitimately (12 letters).
Definitions
by law; conforming to the law
Word origin
From Middle English lawefully, lawfulliche, lawefulliche; equivalent to lawful + -ly.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“By the rules”8 letters
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