For certain men have secretly infiltrated [your ranks]; they are men who had been written about long ago that they should be judged [and condemned] for perverting the unearned favor of our God into [a license for] living unrestrained, indecent lives, and who deny [the identity and work of] our only Master and Lord, Jesus Christ.

Being

But the place for cowards, and unbelievers, and disgusting people [i.e., because of their terrible sins], and murderers, and sexually immoral people, and sorcerers, and idolaters, and all liars, will be the lake that burns with fire and sulphur. This is the second death."

And disobedient

Do not let anyone deceive you with empty words, for because of such things, the wrath of God will fall upon people who are disobedient [to Him].

We [also] know this: Law [or, "the law of Moses"] is not intended for a righteous person, but for lawbreakers and rebels, for ungodly people and sinners, for unholy and irreverent people, for people who kill their parents, for murderers,

Unto

And since these people refused to acknowledge God, He has allowed [or, abandoned] them to have degraded minds and to practice those things which they should not do.

These people oppose the truth just like Jannes and Jambres opposed Moses. They have corrupt minds and are worthless as far as the faith is concerned.