他的真诚毋庸置疑。

There was no doubting his ___sincerity.

他的真诚在他的诗歌中闪耀，至今仍感动着我们。

His ___sincerity shines through from his poems, and it still moves us.

我钦佩她表达感情时的真诚。

I admire her ___sincerity in expressing her feelings.