(س) خَطِئَ يَخْطَاُ خِطْاً وَخَطَاًkhaṭiʾa yakhṭaʾu khiṭan wa-khaṭaan: to deviate from the right path, to err (used for both deliberate and unintentional error). ﴿اِنَّا كُنَّا خٰطِئِيْنَ﴾ (Yūsuf 12:97)
خِطْاٌkhiṭʾ (noun, ism dhāt): deliberate error, sin. ﴿اِنَّ قَتْلَهُمْ كَانَ خِطْاً كَبِيْرًا﴾ (Al-Isrāʾ 17:31)
خَطَاٌkhaṭaʾ (noun, ism dhāt): unintentional error. ﴿وَمَنْ قَتَلَ مُؤْمِنًا خَطَئًا﴾ (An-Nisāʾ 4:92)
خَاطِئٌkhāṭiʾ (active participle, ism fāʿil): one who errs. ﴿نَاصِيَةٍ كَاذِبَةٍ خَاطِئَةٍ﴾ (Al-ʿAlaq 96:16)
خَطِيْٓئَةٌkhaṭīʾah pl. خَطِيْٓئٰتٌkhaṭīʾāt and خَطَايَاkhaṭāyā (noun, ism dhāt): error (whether deliberate or unintentional). ﴿بَلٰى مَنْ كَسَبَ سَيِّئَةً وَّاَحَاطَتْ بِهِۦ خَطِيْٓئَتُهُۥ﴾ (Al-Baqarah 2:81); ﴿نَّغْفِرْ لَكُمْ خَطٰيٰكُمْ﴾ (Al-Baqarah 2:58)
Form IV (ifʿāl) اَخْطَاَ يُخْطِئُ اِخْطَاءًakhṭaʾa yukhṭiʾu ikhṭāʾan: to err unintentionally, to make a mistake. ﴿رَبَّنَا لَا تُؤَاخِذْنَآ اِنْ نَّسِيْنَآ اَوْ اَخْطَاْنَا﴾ (Al-Baqarah 2:286)