Berean Study Bible
They are senseless, faithless, heartless, merciless.

King James Bible
Without understanding, covenantbreakers, without natural affection, implacable, unmerciful:

American Standard Version
without understanding, covenant-breakers, without natural affection, unmerciful:

Darby Bible Translation
void of understanding, faithless, without natural affection, unmerciful;

Douay-Rheims Bible
Foolish, dissolute, without affection, without fidelity, without mercy.

English Revised Version
without understanding, covenant-breakers, without natural affection, unmerciful:

Young's Literal Translation
unintelligent, faithless, without natural affection, implacable, unmerciful;

Romans 1:31 Bible Hub
Romans 1:31 Bible Apps
Romans 1:31 Open Bible