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"convinced" is also used as a crossword clue. If that's what you saw, the answer is often persuaded (9 letters).
Definitions
persuaded of; very sure
Used in a sentence
“He was convinced he was a great singer, though others were not so sure.”
“We convinced him with our skillful arguments and supporting evidence.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Sure in mind”9 letters
02“Fully persuaded”9 letters
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