(ض) كَظَمَ يَكْظِمُ كَظْمًا وَكُظُوْمًاkaẓama yakẓimu kaẓman wa-kuẓūman: to hold back the flow of a thing — such as water, breath or emotion; hence to swallow one's anger and not let it show. (This verb is not used in the Quran.)
كَاظِمٌkāẓim pl. كٰظِمُوْنَkāẓimūna (active participle, ism fāʿil): one who restrains (anger or grief). ﴿وَالْكٰظِمِيْنَ الْغَيْظَ﴾ (Āl ʿImrān 3:134); ﴿اِذِ الْقُلُوْبُ لَدَي الْحَنَاجِرِ كٰظِمِيْنَ﴾ (Ghāfir 40:18)
كَظِيْمٌkaẓīm (on the pattern of فَعِيْلٌfaʿīl, in the sense of a passive participle, ism mafʿūl): one filled with grief who keeps it suppressed. ﴿فَهُوَ كَظِيْمٌ﴾ (Yūsuf 12:84)
مَكْظُوْمٌmakẓūm (passive participle, ism mafʿūl): choked with grief. ﴿اِذْ نَادٰى وَهُوَ مَكْظُوْمٌ﴾ (Al-Qalam 68:48)