(ن) رَدَدَ يَرْدُدُradada yardudu (original form) ⟵ رَدَّ يَرُدُّ رَدًّاradda yaruddu raddan (form in use): to give something back, to return, to turn back. ﴿فَرَدَدْنٰهُ اِلٰٓى اُمِّهِۦ﴾ (Al-Qaṣaṣ 28:13); ﴿ثُمَّ رَدَدْنٰهُ اَسْفَلَ سٰفِلِيْنَ﴾ (At-Tīn 95:5)
رُدَّrudda (imperative, amr): return (it). ﴿رُدُّوْهَا عَلَيَّ﴾ (Ṣād 38:33)
رَآدٌّrādd (active participle, ism fāʿil; اصلاً رَادِدٌaṣlan rādid): one who returns or turns back. ﴿اِنَّ الَّذِيْ فَرَضَ عَلَيْكَ الْقُرْاٰنَ لَرَآدُّكَ اِلٰى مَعَادٍ﴾ (Al-Qaṣaṣ 28:85)
مَرْدُوْدٌmardūd (passive participle, ism mafʿūl): returned, given back. ﴿ءَاِنَّا لَمَرْدُوْدُوْنَ فِي الْحَافِرَةِ﴾ (An-Nāziʿāt 79:10)
مَرَدٌّmaradd (noun of time or place, ẓarf; اصلاً مَرْدَدٌaṣlan mardad): place of return; returning. ﴿فَلَا مَرَدَّ لَهُۥ﴾ (Ar-Raʿd 13:11)
Form V (tafaʿʿul) تَرَدَّدَ يَتَرَدَّدُ تَرَدُّدًاtaraddada yataraddadu taraddudan: to try to turn back but fail; to fall into doubt and uncertainty over a matter, to waver. ﴿فَهُمْ فِيْ رَيْبِهِمْ يَتَرَدَّدُوْنَ﴾ (At-Tawbah 9:45)
Form VIII (iftiʿāl) اِرْتَدَدَ يَرْتَدِدُirtadada yartadidu (original form) ⟵ اِرْتَدَّ يَرْتَدُّ اِرْتِدَادًاirtadda yartaddu irtidādan (form in use): to return, come back or turn back deliberately. ﴿وَمَنْ يَّرْتَدِدْ مِنْكُمْ عَنْ دِيْنِهِۦ﴾ (Al-Baqarah 2:217); ﴿فَارْتَدَّ بَصِيْرًا﴾ (Yūsuf 12:96)