Al-Muddaththir · 74:9

فَذٰلِكَ يَوْمَئِذٍ يَوْمٌ عَس۪يرٌۙ

that will be a Day of anguish for the disbelievers

Word-by-word analysis is only wired up for the demo verses (1:1 and 1:2) for now.