(ک) قَدُسَ يَقْدُسُ قُدْسًاqadusa yaqdusu qudsan: to be pure; it carries the sense of purity from abstract impurity rather than from physical impurity, that is, freedom from defect, deficiency or error of thought, such as being free of polytheism (shirk). (This verb is not used in the Quran.)
قُدُسٌqudus (adjective): pure, holy; «رُوْحُ الْقُدُسِrūḥu al-qudus» is the epithet of the angel Gabriel (Jibrīl), peace be upon him. ﴿وَاَيَّدْنٰهُ بِرُوْحِ الْقُدُسِ﴾ (Al-Baqarah 2:87)
قُدُّوْسٌquddūs (intensive adjective, ṣīghat al-mubālaghah): most holy, free of every defect; one of the beautiful names of God. ﴿الْمَلِكِ الْقُدُّوْسِ الْعَزِيْزِ الْحَكِيْمِ﴾ (Al-Jumuʿah 62:1)
Form II (tafʿīl) قَدَّسَ يُقَدِّسُ تَقْدِيْسًاqaddasa yuqaddisu taqdīsan: to purify someone from abstract impurities; when used of God it means to acknowledge and declare His holiness. ﴿وَنَحْنُ نُسَبِّحُ بِحَمْدِكَ وَنُقَدِّسُ لَكَ﴾ (Al-Baqarah 2:30); مُقَدَّسٌmuqaddas (passive participle, ism mafʿūl): purified, sanctified, holy. ﴿اِنَّكَ بِالْوَادِ الْمُقَدَّسِ طُوًي﴾ (Ṭā Hā 20:12); ﴿يٰقَوْمِ ادْخُلُوا الْاَرْضَ الْمُقَدَّسَةَ﴾ (Al-Māʾidah 5:21)