Nay! The Hour of Judgment is the time promised to deal with them. That hour will be the most grievous and bitter
Dr. Munir Munshey
The fact is that the hour (of Judgment) is their appointed date (with disaster). That hour is far more ruinous and wrenching, a lot more (biting and) bitter
Dr. Kamal Omar
Nay! The Hour is their promised time (for their full recompense); and the Hour is harder and more bitter (for the disbelievers)
Moreover, the Hour (the time when the present world will end and the Hereafter begin) is their tryst with destiny, and the Hour shall be more grievous and bitter
But the hour of judgment is their threatened time of punishment: And that hour shall be more grievous and more bitter than their afflictions in this life
No, the Hour (of death) is when they will meet the suffering! That hour is more intense and more painful (than being defeated in war).
Al-muntakhab fi tafsir al-Qur'an al-Karim
Further, there awaits them the foreordained unfortunate Hour when they come to judgment and indeed worse and worse, painful and grievous, is that predetermined Hour