Root ق س و(q s w) has 6 unique word forms and appears 7 times in the Quran.

Word Translation Occurrences
قَسَتۡ became hardened, hardened, became hardened, hardened 4
فَقَسَتۡ so hardened, so hardened 2
قَسۡوَةٗۚ (in) hardness, (in) hardness 2
قَٰسِيَةٗۖ hard, hard 2
لِّلۡقَٰسِيَةِ to (those are) hardened, to (those are) hardened 2
وَٱلۡقَاسِيَةِ and (are) hardened, and (are) hardened 2