sincerity

When the witness spoke with such obvious sincerity, even the skeptical jury began to believe her testimony.

(Chinese) 当证人表现出如此明显的真诚时，连持怀疑态度的陪审团也开始相信她的证词了。

He doubted the sincerity of the politician's apology, believing it was just a move to win more votes.

(Chinese) 他怀疑这位政治家道歉的诚意，认为这只是为了赢得更多选票的举动。