'Insincerity' in the Bible

The same is true of you: outwardly you seem to the human eye to be good and honest men, but, within, you are full of insincerity and disregard of God's Law.

The rest of the Jews joined him in this hypocrisy [ignoring their knowledge that Jewish and Gentile Christians were united, under the new covenant, into one faith], with the result that even Barnabas was carried away by their hypocrisy.

and above all make your own life a pattern of right conduct, having in your teaching no taint of insincerity, but a serious tone,

But the wisdom from above is first pure [morally and spiritually undefiled], then peace-loving [courteous, considerate], gentle, reasonable [and willing to listen], full of compassion and good fruits. It is unwavering, without [self-righteous] hypocrisy [and self-serving guile].

So put aside every trace of malice and all deceit and hypocrisy and envy and all slander and hateful speech;