(ض) حَسَرَ يَحْسِرُ حَسْرًاḥasara yaḥsiru ḥasran: to tire out, to grieve.
(س) حَسِرَ يَحْسَرُ حَسَرًاḥasira yaḥsaru ḥasaran: to be tired, to be grieved.
حَسْرَةٌḥasrah pl. حَسَرَاتٌḥasarāt (noun, ism dhāt): regret, remorse. ﴿يٰحَسْرَةً عَلَي الْعِبَادِ﴾ (Yā Sīn 36:30); ﴿فَلَا تَذْهَبْ نَفْسُكَ عَلَيْهِمْ حَسَرٰتٍ﴾ (Fāṭir 35:8)
حَسِيْرٌḥasīr (adjective on the pattern of فَعِيْلٌfaʿīl): grief-stricken, unsuccessful. ﴿يَنْقَلِبْ اِلَيْكَ الْبَصَرُ خَاسِئًا وَّهُوَ حَسِيْرٌ﴾ (Al-Mulk 67:4)
مَحْسُوْرٌmaḥsūr (adjective on the pattern of مَفْعُوْلٌmafʿūl): wearied, worn out. ﴿فَتَقْعُدَ مَلُوْمًا مَّحْسُوْرًا﴾ (Al-Isrāʾ 17:29)
Form X (istifʿāl) اِسْتَحْسَرَ يَسْتَحْسِرُ اِسْتِحْسَارًاistaḥsara yastaḥsiru istiḥsāran: to feel weary, to be sluggish, to be slothful. ﴿وَلَا يَسْتَحْسِرُوْنَ﴾ (Al-Anbiyāʾ 21:19)