Tafheem-ul-Quran (En) - Al-Muminoon : 77
حَتّٰۤى اِذَا فَتَحْنَا عَلَیْهِمْ بَابًا ذَا عَذَابٍ شَدِیْدٍ اِذَا هُمْ فِیْهِ مُبْلِسُوْنَ۠   ۧ
until We opened upon them the door of a severe chastisement. Then lo, in this state they become utterly despaired of any good. 73
73. The Arabic word mublis is used for one whom frustration makes so desperate and obdurate that he does not hesitate to resort to any crime. The Devil has been called Iblis for the same reason.
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