Too much exaggeration, a dismissive tone, or lack of eye contact are all sour notes in the tune of sincerity.

太多夸张之词，鄙视的语调，或是缺乏眼神接触都是判断一个人真诚与否负向因素。

youdao

Indeed you SHALL stay here, said Diana, putting her white hand on my head. You SHALL, repeated Mary, in the tone of undemonstrative sincerity which seemed natural to her.

“说实在你应当留在这儿，”黛安娜把她白皙的手搭在我头上说。“你应当这样，”玛丽重复说，口气里透出了含蓄的真诚，这在她似乎是自然的流露。

youdao

You shall, 'repeated Mary, in the tone of undemonstrative sincerity which seemed natural to her.

你应当这样，“玛丽重复说，口气里透出了含蓄的真诚，这在她似乎是自然的流露。”

youdao

President Clinton, whose cynicism never loses its power to astonish, put on a long face and, with that tone of sincerity that betokens his tendentiousness, lamented that the Comprehensive Test Ban Treaty had become tangled in politics.

CENTERFORSECURITYPOLICY: Center for Security Policy | Politics and the Test Ban Treaty, By George F. Will, Newsweek, 20 October 1999