'Impious' in the Bible

For certain people have crept in unnoticed [just as if they were sneaking in by a side door]. They are ungodly persons whose condemnation was predicted long ago, for they distort the grace of our God into decadence and immoral freedom [viewing it as an opportunity to do whatever they want], and deny and disown our only Master and Lord, Jesus Christ.

to execute judgment upon all, and to convict all the ungodly of all the ungodly deeds they have done in an ungodly way, and of all the harsh and cruel things ungodly sinners have spoken against Him.”