She accused him of insincerity.

她指责他缺乏诚意。

I think he is a man of insincerity.

我认为他是个不诚恳的人。

Characterized by insincerity or deceit; evasive.

有不真诚的或欺骗的特征；逃避的。

The great enemy of clear language is insincerity.

清清楚楚的语言的大敌是伪善。

The great enemy of clear language is insincerity.

阻止我们写出简洁句子的敌人是不真诚。