مُجْتَنِبٌ and مُتَقَبِّلٌ are both active participles, but their internal patterns differ.
مُجْتَنِبٌ retains a t between jīm and nūn, with kasrah on nūn.
مُتَقَبِّلٌ retains an initial extra tāʾ and a doubled bāʾ carrying kasrah.
Do not add mu- and freely rebuild the rest of the word: derive from the correct active imperfect to preserve the form-specific features.
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Do not flatten augmented patterns
Active Participles: Definition, Patterns, Paradigms and Derivation
مُجْتَنِبٌ and مُتَقَبِّلٌ are both active participles, but their internal patterns differ.
مُجْتَنِبٌ retains a t between jīm and nūn, with kasrah on nūn.
مُتَقَبِّلٌ retains an initial extra tāʾ and a doubled bāʾ carrying kasrah.
Do not add mu- and freely rebuild the rest of the word: derive from the correct active imperfect to preserve the form-specific features.