Tafsir of Luqman 31:7

وإذا تتلى عليه آياتنا ولى مستكبرا كٲن لم يسمعها كٲن في أذنيه وقرا

And when Our Ayat are recited to such a one, he turns away in pride, as if he heard them not -- as if there were deafness in his ear. means, when these Qur'anic verses are recited to one who is fond of idleness and play, he turns away from them and does not want to hear them. He turns a deaf ear to them as if he can hear nothing, because it annoys him to hear them since he gains no benefit from them and has no interest in them.

فبشره بعذاب أليم

So announce to him a painful torment. i.e., on the Day of Resurrection, which will hurt him just as much as listening to the Book of Allah and its verses hurt him