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Use "sincereness" in a sentence
"Martha rose from her seat to greet her, in the hearty Hawaiian way, arms about, lips on lips, faces eloquent and bodies no less eloquent with sincereness and frank excessiveness of emotion."
"And this also receiveth a difference, which hath neither been well judged of, nor well inquired; for the good of fruition or contentment is placed either in the sincereness of the fruition, or in the quickness and vigour of it; the one superinduced by equality, the other by vicissitude; the one having less mixture of evil, the other more impression of good."
"When it's the thinking like Roy has, and Roy's a sincereness ..."