— The bare triliteral (thulāthī mujarrad) is not in use.
Form II (tafʿīl) شَبَّهَ يُشَبِّهُ تَشْبِيْهًاshabbaha yushabbihu tashbīhan: (1) to make similar (2) to cast into doubt or confusion (to make so similar that distinguishing becomes difficult). ﴿وَلٰكِنْ شُبِّهَ لَهُمْ﴾ (An-Nisāʾ 4:157)
Form III (mufāʿalah) شَابَهَ يُشَابِهُ مُشَابَهَةًshābaha yushābihu mushābahatan: to resemble someone; to be alike in appearance (this verb is not used in the Quran).
Form VI (tafāʿul) تَشَابَهَ يَتَشَابَهُ تَشَابُهًاtashābaha yatashābahu tashābuhan: to resemble one another (to be so alike that doubt arises). ﴿اِنَّ الْبَقَرَ تَشٰبَهَ عَلَيْنَا﴾ (Al-Baqarah 2:70)
مُتَشَابِهٌmutashābih (active participle, ism fāʿil): mutually resembling, alike. ﴿وَاُخَرُ مُتَشٰبِهٰتٌ﴾ (Āl ʿImrān 3:7)
Form VIII (iftiʿāl) اِشْتَبَهَ يَشْتَبِهُ اِشْتِبَاهًاishtabaha yashtabihu ishtibāhan: to resemble someone; مُشْتَبِهٌmushtabih (active participle, ism fāʿil). ﴿مُشْتَبِهًا وَّغَيْرَ مُتَشَابِهٍ﴾ (Al-Anʿām 6:99)