(س) خَفِيَ يَخْفٰى خَفَآءً وَخُفْيَةًkhafiya yakhfā khafāʾan wa-khufyatan: to be hidden, to be concealed. ﴿اِنَّ اللّٰهَ لَا يَخْفٰى عَلَيْهِ شَيْءٌ فِي الْاَرْضِ وَلَا فِي السَّمَآءِ﴾ (Āl ʿImrān 3:5)
خُفْيَةٌkhufyah: in secret, stealthily. ﴿اُدْعُوْا رَبَّكُمْ تَضَرُّعًا وَّخُفْيَةً﴾ (Al-Aʿrāf 7:55)
خَافٍkhāf (active participle, ism fāʿil): hidden, what is concealed; خَافِيَةٌkhāfiyah: a hidden matter, secret. ﴿لَا تَخْفٰى مِنْكُمْ خَافِيَةٌ﴾ (Al-Ḥāqqah 69:18)
اَخْفٰىakhfā (elative, ism tafḍīl): more hidden. ﴿فَاِنَّهُۥ يَعْلَمُ السِّرَّ وَاَخْفٰى﴾ (Ṭā Hā 20:7)
خَفِيٌّkhafiyy (adjective on the pattern فَعِيْلٌfaʿīl): hidden, soft, low. ﴿اِذْ نَادٰى رَبَّهُۥ نِدَآءً خَفِيًّا﴾ (Maryam 19:3)
Form IV (ifʿāl) اَخْفٰى يُخْفِيْ اِخْفَاءًakhfā yukhfī ikhfāʾan: to hide, to conceal. ﴿اِنْ تُبْدُوْا مَا فِيْٓ اَنْفُسِكُمْ اَوْ تُخْفُوْهُ﴾ (Al-Baqarah 2:284)
Form X (istifʿāl) اِسْتَخْفٰى يَسْتَخْفِيْ اِسْتِخْفَاءًistakhfā yastakhfī istikhfāʾan: to seek concealment, i.e. to hide oneself. ﴿يَسْتَخْفُوْنَ مِنَ النَّاسِ وَلَا يَسْتَخْفُوْنَ مِنَ اللّٰهِ﴾ (An-Nisāʾ 4:108)
مُسْتَخْفٍmustakhf (active participle, ism fāʿil): one who hides himself. ﴿وَمَنْ هُوَ مُسْتَخْفٍۭ بِالَّيْلِ﴾ (Ar-Raʿd 13:10)