stubbornness and heedlessness

وَمَا يَأْتِيهِم مِّن ذِكْرٍ مِّنَ ٱلرَّحْمَـٰنِ مُحْدَثٍ إِلَّا كَانُوا۟ عَنْهُ مُعْرِضِينَ

And no mention [i.e., revelation] comes to them anew from the Most Merciful except that they turn away from it.

كَأَنَّهُمْ حُمُرٌ مُّسْتَنفِرَةٌ

As if they were alarmed donkeys.