ف ک رf-k-r
(ض) فَكَرَ يَفْكِرُ فَكْرًاfakara yafkiru fakran: to think, to reflect. (This verb is not used in the Quran.)
Form II (tafʿīl) فَكَّرَ يُفَكِّرُ تَفْكِيْرًاfakkara yufakkiru tafkīran: to reflect much, to think deeply. ﴿اِنَّهُۥ فَكَّرَ وَقَدَّرَ﴾ (Al-Muddaththir 74:18)
Form V (tafaʿʿul) تَفَكَّرَ يَتَفَكَّرُ تَفَكُّرًاtafakkara yatafakkaru tafakkuran: to ponder carefully and deliberately. ﴿وَيَتَفَكَّرُوْنَ فِيْ خَلْقِ السَّمٰوٰتِ وَالْاَرْضِ﴾ (Āl ʿImrān 3:191)