نُكْر

قَالَ أَمَّا مَن ظَلَمَ فَسَوْفَ نُعَذِّبُهُۥ ثُمَّ يُرَدُّ إِلَىٰ رَبِّهِۦ فَيُعَذِّبُهُۥ عَذَابًۭا نُّكْرًۭا

He said, "As for one who wrongs, we will punish him. Then he will be returned to his Lord, and He will punish him with a terrible punishment [i.e., Hellfire].

وَكَأَيِّن مِّن قَرْيَةٍ عَتَتْ عَنْ أَمْرِ رَبِّهَا وَرُسُلِهِۦ فَحَاسَبْنَـٰهَا حِسَابًۭا شَدِيدًۭا وَعَذَّبْنَـٰهَا عَذَابًۭا نُّكْرًۭا

And how many a city was insolent toward the command of its Lord and His messengers, so We took it to severe account and punished it with a terrible punishment.

فَٱنطَلَقَا حَتَّىٰٓ إِذَا لَقِيَا غُلَـٰمًۭا فَقَتَلَهُۥ قَالَ أَقَتَلْتَ نَفْسًۭا زَكِيَّةًۢ بِغَيْرِ نَفْسٍۢ لَّقَدْ جِئْتَ شَيْـًۭٔا نُّكْرًۭا

So they set out, until when they met a boy, he [i.e., al-Khiḍr] killed him. [Moses] said, "Have you killed a pure soul for other than [having killed] a soul? You have certainly done a deplorable thing."