“undiscerning, untrustworthy, unloving, unforgiving, unmerciful;”
This verse contains five sins beginning with the prefix “un.” The repetition carries a force in the Greek. These people are “not,” “not,” “not,” “not,” and “not.” All five terms sound similar. This describes souls estranged from God.
“Undiscerning” means without intelligence. These people are unintelligent because they choose a system for coming to truth other than God’s revelation. They have no divine understanding of things.
People void of the Word of God do not operate with God’s intelligence.
Some people are stupid when it comes to God’s revelation. It is a stupidity that comes from an unwillingness to listen to God. They cannot have true moral understanding without the intervention of the knowledge of God from eternity; that is, revelation.
1 Co 2:14, But the natural man does not receive the things of the Spirit of God, for they are foolishness to him; nor can he know them, because they are spiritually discerned.
Non-Christians have negative volition toward revelation. They have no concept of applying eternal principles to their experience.