• تَضَرُّع
• تَضَرَّعُوا۟
• ضَرِيع
• يَتَضَرَّعُونَ
• يَضَّرَّعُونَ

Appears 8 times in the Quran.

1. 6:42 وَلَقَدْ أَرْسَلْنَآ إِلَىٰٓ أُمَمٍ مِّن قَبْلِكَ فَأَخَذْنَٰهُم بِٱلْبَأْسَآءِ وَٱلضَّرَّآءِ لَعَلَّهُمْ يَتَضَرَّعُونَ

   And certainly We sent (messengers) to nations before you then We seized them with distress and affliction in order that they might humble themselves.
   

2. 6:43 فَلَوْلَآ إِذْ جَآءَهُم بَأْسُنَا تَضَرَّعُوا۟ وَلَٰكِن قَسَتْ قُلُوبُهُمْ وَزَيَّنَ لَهُمُ ٱلشَّيْطَٰنُ مَا كَانُوا۟ يَعْمَلُونَ

   Yet why did they not, when Our punishment came to them, humble themselves? But their hearts hardened and the Shaitan made what they did fair-seeming to them.
   

3. 6:63 قُلْ مَن يُنَجِّيكُم مِّن ظُلُمَٰتِ ٱلْبَرِّ وَٱلْبَحْرِ تَدْعُونَهُۥ تَضَرُّعًا وَخُفْيَةً لَّئِنْ أَنجَىٰنَا مِنْ هَٰذِهِۦ لَنَكُونَنَّ مِنَ ٱلشَّٰكِرِينَ

   Say: Who is it that delivers you from the dangers of the land and the sea (when) you call upon Him (openly) humiliating yourselves, and in secret: If He delivers us from this, we should certainly be of the grateful ones.
   

4. 7:55 ٱدْعُوا۟ رَبَّكُمْ تَضَرُّعًا وَخُفْيَةً إِنَّهُۥ لَا يُحِبُّ ٱلْمُعْتَدِينَ

   Call on your Lord humbly and secretly; surely He does not love those who exceed the limits.
   

5. 7:94 وَمَآ أَرْسَلْنَا فِى قَرْيَةٍ مِّن نَّبِىٍّ إِلَّآ أَخَذْنَآ أَهْلَهَا بِٱلْبَأْسَآءِ وَٱلضَّرَّآءِ لَعَلَّهُمْ يَضَّرَّعُونَ

   And We did not send a prophet in a town but We overtook its people with distress and affliction in order that they might humble themselves.
   

6. 7:205 وَٱذْكُر رَّبَّكَ فِى نَفْسِكَ تَضَرُّعًا وَخِيفَةً وَدُونَ ٱلْجَهْرِ مِنَ ٱلْقَوْلِ بِٱلْغُدُوِّ وَٱلْءَاصَالِ وَلَا تَكُن مِّنَ ٱلْغَٰفِلِينَ

   And remember your Lord within yourself humbly and fearing and in a voice not loud in the morning and the evening and be not of the heedless ones.
   

7. 23:76 وَلَقَدْ أَخَذْنَٰهُم بِٱلْعَذَابِ فَمَا ٱسْتَكَانُوا۟ لِرَبِّهِمْ وَمَا يَتَضَرَّعُونَ

   And already We overtook them with chastisement, but they were not submissive to their Lord, nor do they humble themselves.
   

8. 88:6 لَّيْسَ لَهُمْ طَعَامٌ إِلَّا مِن ضَرِيعٍ

   They shall have no food but of thorns,