Rejection of divine signs and guidance

۞ إِنَّ شَرَّ ٱلدَّوَآبِّ عِندَ ٱللَّهِ ٱلصُّمُّ ٱلْبُكْمُ ٱلَّذِينَ لَا يَعْقِلُونَ

Indeed, the worst of living creatures in the sight of Allāh are the deaf and dumb who do not use reason [i.e., the disbelievers].