adjective
a word that describes or gives more information about a noun or pronoun, in this case, 'sincere' describes someone or something genuine and honest
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Her sincere apology was well received by the board of directors.
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I can tell you're being sincere about your feelings.
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He's always so real, never fake - he's sincere.
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The artist's work was a sincere expression of their innermost thoughts and emotions.