ح ن ثḥ-n-th
(س) حَنِثَ يَحْنَثُ حِنْثًاḥanitha yaḥnathu ḥinthan: to break an oath; the original sense is that of sin and inclination. ﴿وَلَا تَحْنَثْ﴾ (Ṣād 38:44). Note: the verb form is determined from the Quranic form «تَحْنَثْtaḥnath». This root occurs 2 times in the Quran.
حِنْثḥinth (noun, ism dhāt): a great sin; violation of an oath. ﴿وَكَانُوْا يُصِرُّوْنَ عَلَي الْحِنْثِ الْعَظِيْمِ﴾ (Al-Wāqiʿah 56:46)