The Quran

يَومَ تَرَونَها تَذهَلُ كُلُّ مُرضِعَةٍ عَمّا أَرضَعَت وَتَضَعُ كُلُّ ذاتِ حَملٍ حَملَها وَتَرَى النّاسَ سُكارىٰ وَما هُم بِسُكارىٰ وَلٰكِنَّ عَذابَ اللَّهِ شَديدٌ

Muhammad Asad

On the Day when you behold it, every woman that feeds a child at her breast will utterly forget her nursling, and every woman heavy with child will bring forth her burden [before her time]; and it will seem to thee that all mankind is drunk,¹ although they will not be drunk - but vehement will be [their dread of] God's chastisement.²

Lit., "thou shalt see [or "behold"] mankind drunk", i.e., behaving as if they were drunk. The illusory, purely subjective character of this "seeing" - implied in the use of the singular form tara ("thou shalt see") after the plural "you" employed in the first clause of this verse - justifies the rendering "it will seem to thee that...", etc.
My interpolation of the words "their dread of" is based on the statement in 21:103 that, as far as the righteous are concerned, "the supreme awesomeness [of the Day of Resurrection] will cause them no grief" despite the dread with which it will overwhelm every human being.