(ح) وَثِقَ يَثِقُ ثِقَةً وَوُثُوْقًاwathiqa yathiqu thiqatan wa-wuthūqan: to rely on someone, to trust; (ک) وَثُقَ يَوْثُقُ وَثَاقَةًwathuqa yawthuqu wa-thāqatan: to be firm, to be solid. (This verb is not used in the Quran.)
ثِقَةٌthiqah (verbal noun (maṣdar), also adjective): trustworthy. (This word is not used in the Quran.)
وَثَاقٌwathāq (noun, ism dhāt): a rope or chain for binding, a bond. ﴿فَشُدُّوا الْوَثَاقَ﴾ (Muḥammad 47:4)
مَوْثِقٌmawthiq (on the pattern of مَفْعِلٌmafʿil): a firm promise, a covenant (with an oath). ﴿حَتّٰى تُؤْتُوْنِ مَوْثِقًا مِّنَ اللّٰهِ﴾ (Yūsuf 12:66)
وُثْقٰىwuthqā (elative (ism tafḍīl), feminine اَوْثَقُawthaqu): firmer, stronger. ﴿فَقَدِ اسْتَمْسَكَ بِالْعُرْوَةِ الْوُثْقٰى﴾ (Al-Baqarah 2:256)
مِيْثَاقٌmīthāq (اصلاً مِوْثَاقٌaṣlan miwthāq, noun of instrument (ism ālah) on the pattern of مِفْعَالٌmifʿāl): a rope for binding fast; a firm covenant. ﴿وَاِذْ اَخَذَ اللّٰهُ مِيْثَاقَ النَّبِيِّۦنَ﴾ (Āl ʿImrān 3:81)
Form II (tafʿīl) وَثَّقَ يُوَثِّقُ تَوْثِيْقًاwaththaqa yuwaththiqu tawthīqan: to strengthen; to authenticate (a statement or document); to certify (this verb is not used in the Quran).
Form IV (ifʿāl) اَوْثَقَ يُوْثِقُ اِيْثَاقًاawthaqa yūthiqu īthāqan: to bind firmly, to fetter. ﴿وَّلَا يُوْثِقُ وَثَاقَهُۥٓ اَحَدٌ﴾ (Al-Fajr 89:26)
Form III (mufāʿalah) وَاثَقَ يُوَاثِقُ مُوَاثَقَةًwāthaqa yuwāthiqu muwāthaqatan: to take a firm covenant from someone. ﴿وَمِيْثَاقَهُ الَّذِيْ وَاثَقَكُمْ بِهِۦٓ﴾ (Al-Māʾidah 5:7)