غ ل ظgh-l-ẓ
(ک) غَلُظَ يَغْلُظُ غِلَظًا وَغِلْظَةًghaluẓa yaghluẓu ghilaẓan wa-ghilẓatan: to be thick, to be coarse; to be harsh.
اُغْلُظْughluẓ (imperative (amr)): be harsh! ﴿وَاغْلُظْ عَلَيْهِمْ﴾ (At-Tawbah 9:73)
غِلْظَةٌghilẓah (both a verbal noun (maṣdar) and a noun (ism dhāt)): thickness, harshness. ﴿وَلْيَجِدُوْا فِيْكُمْ غِلْظَةً﴾ (At-Tawbah 9:123)
غَلِيْظٌghalīẓ pl. غِلَاظٌghilāẓ (adjective on the pattern of فَعِيْلٌfaʿīl): harsh. ﴿وَلَوْ كُنْتَ فَظًّا غَلِيْظَ الْقَلْبِ﴾ (Āl ʿImrān 3:159)
Form X (istifʿāl) اِسْتَغْلَظَ يَسْتَغْلِظُ اِسْتِغْلَاظًاistaghlaẓa yastaghliẓu istighlāẓan: to grow thick and strong gradually. ﴿فَاٰزَرَهُۥ فَاسْتَغْلَظَ﴾ (Al-Fatḥ 48:29)