Romans 1:31

conscienceless, treacherous, with no human love or pity.

2 Timothy 3:3

lacking in love for kinsmen, irreconcilable, slanderers, having no self-control, savage, lacking in love for the good,

Matthew 15:16

And He said, "Are you too, even yet, without understanding?

Romans 1:20-21

Forever since the creation of the world, His invisible characteristics -- His eternal power and divine nature -- have been made intelligible and clearly visible by His works. So they are without excuse,

Romans 3:11

No one understands, no one is searching for God;

Treasury of Scripture Knowledge

Summary

Without understanding, covenantbreakers, without natural affection, implacable, unmerciful:

Without understanding

Covenant-breakers

Bible References

Without understanding

Romans 1:20
Forever since the creation of the world, His invisible characteristics -- His eternal power and divine nature -- have been made intelligible and clearly visible by His works. So they are without excuse,
Romans 3:11
No one understands, no one is searching for God;
Matthew 15:16
And He said, "Are you too, even yet, without understanding?

Covenant-breakers

2 Timothy 3:3
lacking in love for kinsmen, irreconcilable, slanderers, having no self-control, savage, lacking in love for the good,