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"convincing" is also used as a crossword clue. If that's what you saw, the answer is often persuasive (10 letters).
Definitions
causing one to believe the truth of something
Used in a sentence
“Our convincing evidence was sufficient in the end to win the trial.”
“While they have still only suffered one home defeat by Spurs in 19 years, this was not as convincing a victory as the scoreline suggests.”
“Convincings depend on someone trying to do the convincing and someone who is supposed to be convinced.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Persuasive”10 letters
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