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"justly" is also used as a crossword clue. If that's what you saw, the answer is often rightfully (10 letters).
Definitions
in accordance with moral or social standards
Word origin
From just + -ly.
Used in a sentence
“His valor, wisdom, and justice made him justly popular, but caused him to be regarded with suspicion at Rome.”
“But the city on the River Clyde can justly claim to have turned the tide.”
“It is a pleasant imagination to conceive a spirit iustly ballanced betweene two equall desires.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“With fairness”6 letters
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