• تَعَاسَرْتُمْ
• عَسِر
• عُسْر
• عُسْرَة
• عُسْرَىٰ
• عَسِير

Appears 12 times in the Quran.

1. 2:185 شَهْرُ رَمَضَانَ ٱلَّذِىٓ أُنزِلَ فِيهِ ٱلْقُرْءَانُ هُدًى لِّلنَّاسِ وَبَيِّنَٰتٍ مِّنَ ٱلْهُدَىٰ وَٱلْفُرْقَانِ فَمَن شَهِدَ مِنكُمُ ٱلشَّهْرَ فَلْيَصُمْهُ وَمَن كَانَ مَرِيضًا أَوْ عَلَىٰ سَفَرٍ فَعِدَّةٌ مِّنْ أَيَّامٍ أُخَرَ يُرِيدُ ٱللَّهُ بِكُمُ ٱلْيُسْرَ وَلَا يُرِيدُ بِكُمُ ٱلْعُسْرَ وَلِتُكْمِلُوا۟ ٱلْعِدَّةَ وَلِتُكَبِّرُوا۟ ٱللَّهَ عَلَىٰ مَا هَدَىٰكُمْ وَلَعَلَّكُمْ تَشْكُرُونَ

   The month of Ramazan is that in which the Quran was revealed, a guidance to men and clear proofs of the guidance and the distinction; therefore whoever of you is present in the month, he shall fast therein, and whoever is sick or upon a journey, then (he shall fast) a (like) number of other days; Allah desires ease for you, and He does not desire for you difficulty, and (He desires) that you should complete the number and that you should exalt the greatness of Allah for His having guided you and that you may give thanks.
   

2. 2:280 وَإِن كَانَ ذُو عُسْرَةٍ فَنَظِرَةٌ إِلَىٰ مَيْسَرَةٍ وَأَن تَصَدَّقُوا۟ خَيْرٌ لَّكُمْ إِن كُنتُمْ تَعْلَمُونَ

   And if (the debtor) is in straitness, then let there be postponement until (he is in) ease; and that you remit (it) as alms is better for you, if you knew.
   

3. 9:117 لَّقَد تَّابَ ٱللَّهُ عَلَى ٱلنَّبِىِّ وَٱلْمُهَٰجِرِينَ وَٱلْأَنصَارِ ٱلَّذِينَ ٱتَّبَعُوهُ فِى سَاعَةِ ٱلْعُسْرَةِ مِنۢ بَعْدِ مَا كَادَ يَزِيغُ قُلُوبُ فَرِيقٍ مِّنْهُمْ ثُمَّ تَابَ عَلَيْهِمْ إِنَّهُۥ بِهِمْ رَءُوفٌ رَّحِيمٌ

   Certainly Allah has turned (mercifully) to the Prophet and those who fled (their homes) and the helpers who followed him in the hour of straitness after the hearts of a part of them were about to deviate, then He turned to them (mercifully); surely to them He is Compassionate, Merciful.
   

4. 18:73 قَالَ لَا تُؤَاخِذْنِى بِمَا نَسِيتُ وَلَا تُرْهِقْنِى مِنْ أَمْرِى عُسْرًا

   He said: Blame me not for what I forgot, and do not constrain me to a difficult thing in my affair.
   

5. 25:26 ٱلْمُلْكُ يَوْمَئِذٍ ٱلْحَقُّ لِلرَّحْمَٰنِ وَكَانَ يَوْمًا عَلَى ٱلْكَٰفِرِينَ عَسِيرًا

   The kingdom on that day shall rightly belong to the Beneficent Allah, and a hard day shall it be for the unbelievers.
   

6. 54:8 مُّهْطِعِينَ إِلَى ٱلدَّاعِ يَقُولُ ٱلْكَٰفِرُونَ هَٰذَا يَوْمٌ عَسِرٌ

   Hastening to the inviter. The unbelievers shall say: This is a hard day.
   

7. 65:6 أَسْكِنُوهُنَّ مِنْ حَيْثُ سَكَنتُم مِّن وُجْدِكُمْ وَلَا تُضَآرُّوهُنَّ لِتُضَيِّقُوا۟ عَلَيْهِنَّ وَإِن كُنَّ أُو۟لَٰتِ حَمْلٍ فَأَنفِقُوا۟ عَلَيْهِنَّ حَتَّىٰ يَضَعْنَ حَمْلَهُنَّ فَإِنْ أَرْضَعْنَ لَكُمْ فَـَٔاتُوهُنَّ أُجُورَهُنَّ وَأْتَمِرُوا۟ بَيْنَكُم بِمَعْرُوفٍ وَإِن تَعَاسَرْتُمْ فَسَتُرْضِعُ لَهُۥٓ أُخْرَىٰ

   Lodge them where you lodge according to your means, and do not injure them in order that you may straiten them; and if they are pregnant, spend on them until they lay down their burden; then if they suckle for you, give them their recompense and enjoin one another among you to do good; and if you disagree, another (woman) shall suckle for him.
   

8. 65:7 لِيُنفِقْ ذُو سَعَةٍ مِّن سَعَتِهِۦ وَمَن قُدِرَ عَلَيْهِ رِزْقُهُۥ فَلْيُنفِقْ مِمَّآ ءَاتَىٰهُ ٱللَّهُ لَا يُكَلِّفُ ٱللَّهُ نَفْسًا إِلَّا مَآ ءَاتَىٰهَا سَيَجْعَلُ ٱللَّهُ بَعْدَ عُسْرٍ يُسْرًا

   Let him who has abundance spend out of his abundance and whoever has his means of subsistence straitened to him, let him spend out of that which Allah has given him; Allah does not lay on any soul a burden except to the extent to which He has granted it; Allah brings about ease after difficulty.
   

9. 74:9 فَذَٰلِكَ يَوْمَئِذٍ يَوْمٌ عَسِيرٌ

   That, at that time, shall be a difficult day,
   

10. 92:10 فَسَنُيَسِّرُهُۥ لِلْعُسْرَىٰ

    We will facilitate for him the difficult end.
    

11. 94:5 فَإِنَّ مَعَ ٱلْعُسْرِ يُسْرًا

    Surely with difficulty is ease.
    

12. 94:6 إِنَّ مَعَ ٱلْعُسْرِ يُسْرًا

    With difficulty is surely ease.