لَا يُفَتَّرُ عَنْهُمْ وَهُمْ فِيهِ مُبْلِسُونَ 
  L a  yufattaru AAanhum wahum feehi mublisoon a      it will not be lightened for them; and therein they will be lost    in hopeless despair.
   - Mohammad Asad
     
Their punishment will never be lightened, and they shall remain    despair therein.
   - Muhammad Farooq-i-Azam Malik
   It will never be lightened for them, and there they will be overwhelmed with despair.
   - Mustafa Khattab
     
It is not relaxed for them, and they despair therein.
   - Marmaduke Pickthall
   Nowise will the (punishment) be lightened for them and in despair    will they be there overwhelmed.
   - Abdullah Yusuf Ali