ا س فʾ-s-f
(س) اَسِفَ يَأْسَفُ اَسَفًاasifa yaʾsafu asafan: to grieve, to be sorrowful. ﴿يٰٓاَسَفٰى عَلٰى يُوْسُفَ﴾ (Yūsuf 12:84)
اَسِفٌasif (adjective): sorrowful, grieved. ﴿غَضْبَانَ اَسِفًا﴾ (Al-Aʿrāf 7:150)
Form IV (ifʿāl) اٰسَفَ يُؤْسِفُ اِيْسَافًاasafa yuʾsifu īsāfan: to grieve someone, to provoke to anger. ﴿فَلَمَّآ اٰسَفُوْنَا انْتَقَمْنَا مِنْهُمْ﴾ (Az-Zukhruf 43:55)
Form V (tafaʿʿul) تَأَسَّفَ يَتَأَسَّفُ تَأَسُّفًاtaʾassafa yataʾassafu taʾassufan: to regret; to express sorrow (this verb is not used in the Quran).