他看起来很真诚。

He seems to be ___sincere.

这些年来，我也发现她诚实、真诚、勤奋且富有想象力。

During these years I have also found her to be honest, ___sincere, hard-working and imaginative.

我欣赏她为错误所做的真诚道歉。

I appreciate her ___sincere apology for the mistake.