But those who disbelieve will not cease to be in doubt of (22:55)

Almuntakhab Fi Tafsir Alquran Alkarim

Nevertheless, the infidels continue to be in doubt of the divine nature of it -the Quran- and will remain undecided until the sudden encounter with death taking them by surprise planting their great Hereafter in the now or until they face the disastrous Day of Judgement which is barren of their expectations and their hopes are doomed to disappointment

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(22:55) Yet the disbelievers will always remain in doubt about it until the Hour of Resurrection overtakes them suddenly or the scourge of a "barren" day *102 descends upon them.

But those who disbelieve will not cease to be in doubt of meaning

*102) The epithet "barren" has been applied to the "day" in its metaphorical and not literal sense. :A "day" is barren if all the plans, hopes and devices remain unproductive in it, or it dces not bring forth its night. For instance, the days on which the people of Prophet Noah, the tribes of `Ad and _Thamud, the people of Lot and of Midian met with their destruction by scourge from Allah, were barren days in this sense, because those days did not bring forth any "tomorrow" for them, and no device of theirs could avert their doom.
 

But those who disbelieve will not cease to be in doubt of meaning in Urdu

انکار کرنے والے تو اس کی طرف سے شک ہی میں پڑے رہیں گے یہاں تک کہ یا تو اُن پر قیامت کی گھڑی اچانک آ جائے، یا ایک منحوس دن کا عذاب نازل ہو جائے