Jude is referencing the preaching of pre-Flood Enoch, who warned about God’s coming judgment when the Lord returns “with ten thousands of his saints” (v. 14). Jude identifies two ungodly traits that bring about this judgment.

First, there are ungodly deeds that were committed in an ungodly way. Perhaps the best commentary on this deep sin is the Lord Jesus’ description of the unbelief of those who reject the gospel of salvation: “This is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil” (John 3:19). Their actions were not mere misdeeds; these deeds were committed with full knowledge of the “light”—and their perpetrators consciously ran away from that light to hide in the “darkness.”

Then there are hard speeches that have been spoken by ungodly sinners against the Lord Jesus. Perhaps these fierce words were uttered as diatribes against the authority of Christ to judge. Peter alludes to these kinds of sinners as “scoffers, walking after their own lusts, and saying, Where is the promise of his coming?” (2 Peter 3:3-4). Paul comments that these kinds of people “changed the truth of God into a lie, and worshipped and served the creature more than the Creator” (Romans 1:25).

And that appears to coincide with the nature of the word “ungodly.” All three forms that appear in Jude 1:15 are negative forms of the word for worship. The “un” part of the word stresses the lack of honor and deference that are due the Creator of the universe. These ungodly sinners will be condemned by their own deeds and fierce words. HMM III

From the Institute for Creation Research