Concise Quran Commentary
On the day when the hour arrives, the criminals shall lose hope in the mercy of Allah and their hopes in Allah's mercy will end just as their arguments/excuses will end.
وَيَوْمَ تَقُومُ ٱلسَّاعَةُ يُبْلِسُ ٱلْمُجْرِمُونَ
On the Day when the Hour begins, the wicked will be in utmost despair.