أَسْوَأ
Appears 2 times in the Quran.
(Root: سوا)
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39:35 لِيُكَفِّرَ ٱللَّهُ عَنْهُمْ أَسْوَأَ ٱلَّذِى عَمِلُوا۟ وَيَجْزِيَهُمْ أَجْرَهُم بِأَحْسَنِ ٱلَّذِى كَانُوا۟ يَعْمَلُونَ
So that Allah will do away with the worst of what they did and give them their reward for the best of what they do.
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41:27 فَلَنُذِيقَنَّ ٱلَّذِينَ كَفَرُوا۟ عَذَابًا شَدِيدًا وَلَنَجْزِيَنَّهُمْ أَسْوَأَ ٱلَّذِى كَانُوا۟ يَعْمَلُونَ
Therefore We will most certainly make those who disbelieve taste a severe punishment, and We will most certainly reward them for the evil deeds they used to do.