'Insincerely' in the Bible

When defeated, they will be helped by some, but many others will join them insincerely.

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.

The former insincerely preach Christ from selfish ambition, thinking that they add affliction to my chains;

but the former preach Christ [insincerely] out of selfish ambition [just self-promotion], thinking that they are causing me distress in my imprisonment.