Usually I am not quick to equate in my thinking that one is ignorant, but if you take time to read 2 Peter 2, you can see with validity why Peter draws such a conclusion about some of the people he is writing about and to.
For instance, Noah, the “great preacher of righteousness” had spent a hundred years building the ark before God destroyed the earth and its inhabitants for their ungodly living. Lot is described as “righteous” and God protected him even though he chose to live amongst “sensual and unprincipled men”. Ignorance led to him feeling “his righteous soul tormented day after day”.
While I might not be categorized with the intellects of this hour, I certainly have acquired enough common sense not to be entrenched in “corrupt desires and despise authority, daring, self-willed, or reviling angelic majesties. As Peter continues to give descriptions of the ungodly—revelers, deceivers, enticers, greedy, and those who loved the wages of unrighteousness! He uses Balaam as a further illustration, having been rebuked for his own transgression, received a word from a mute donkey. You cannot help but conclude that one had to be ignorant to allow himself, with all his knowledge of the Lord, and His working, to end up being a “slave of corruption”.
Following such a description get a further glimpse into Peter’s rebuke to these scattered tribes –“After they have escaped the defilements of the world by the knowledge of the Lord and Savior Jesus Christ, they are again entangled in them and are overcome, the last state has become worse for them than the first. For it is better for them not to have known the way of righteousness, than having known it, to turn away from the holy commandment handed down to them. It has happened to them according to the true proverb, “A dog returns to its own vomit,” and, “A sow, after washing, returns to wallowing in the mire”.
I have quoted at liberty from the New American Standard Bible, which I always use, and if you picture people as I envision them, this type of a person is ignorant. Avoid falling into the same pit!