They would not forbid each other of wrongdoings; what an evil way of life they had chosen [this indicates that encouraging the righteousness and forbidding the wrongdoings was a part of “original” Judeo-Christianity as it is one of the main pillars of Islam.]
Faridul Haque
They did not restrain one another from the evil they used to do; undoubtedly they used to commit extremely evil deeds
Hasan Al-Fatih Qaribullah
They did not forbid one another from the wrongdoing they were committing. Evil is what they were doing
(And they were also cursed because) they would not prevent one another from the evil deeds they used to do. Certainly, evil were the deeds they used to do
They used not to forbid one another from the Munkar (wrong, evildoing, sins, polytheism, disbelief, etc.) which they committed. Vile indeed was what they used to do
They did not prevent one another from the bad deeds that they did. How wretched were their deeds!
Sayyed Abbas Sadr-Ameli
They used not to restrain each other from any dishonour they committed. Certainly evil was that which they were doing!
Al-muntakhab fi tafsir al-Qur'an al-Karim
They never exhorted each other to laudable conduct but they shut their eyes to iniquities and abuses. Evil indeed is what they perpetrated of atrocities and wrong deeds