ٱغْلُظْ
Appears 2 times in the Quran.
(Root: غلظ)
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9:73 يَٰٓأَيُّهَا ٱلنَّبِىُّ جَٰهِدِ ٱلْكُفَّارَ وَٱلْمُنَٰفِقِينَ وَٱغْلُظْ عَلَيْهِمْ وَمَأْوَىٰهُمْ جَهَنَّمُ وَبِئْسَ ٱلْمَصِيرُ
O Prophet! strive hard against the unbelievers and the hypocrites and be unyielding to them; and their abode is hell, and evil is the destination.
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66:9 يَٰٓأَيُّهَا ٱلنَّبِىُّ جَٰهِدِ ٱلْكُفَّارَ وَٱلْمُنَٰفِقِينَ وَٱغْلُظْ عَلَيْهِمْ وَمَأْوَىٰهُمْ جَهَنَّمُ وَبِئْسَ ٱلْمَصِيرُ
O Prophet! strive hard against the unbelievers and the hypocrites, and be hard against them; and their abode is hell; and evil is the resort.